[TEST] Replace _source.mode with index.mapping.source.mode in integration tests - take 2 (#116072)

* Reapply "[TEST] Replace _source.mode with index.mapping.source.mode in integra…" (#116069)

This reverts commit e8bf344a28.

* [TEST] Replace _source.mode with index.mapping.source.mode in integration tests

* add reason

* add reason

* spotless

* revert unneeded

modules/aggregations/src/yamlRestTest/resources/rest-api-spec/test/aggregations/top_hits.yml

@@ -349,16 +349,17 @@ sequence number and primary term:
 ---
 synthetic _source:
   - requires:
-      cluster_features: ["gte_v8.4.0"]
-      reason: introduced in 8.4.0
+      cluster_features: ["mapper.source.mode_from_index_setting"]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test_synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               page:
                 type: keyword

modules/lang-painless/src/yamlRestTest/resources/rest-api-spec/test/painless/50_script_doc_values.yml

@@ -1,4 +1,7 @@
 setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
   - do:
       indices.create:
         index: test
@@ -180,9 +183,9 @@ setup:
         body:
           settings:
             number_of_shards: 1
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               boolean:
                 type: boolean
@@ -5630,9 +5633,9 @@ version and sequence number synthetic _source:
         body:
           settings:
             number_of_shards: 1
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/match_only_text/10_basic.yml

@@ -278,16 +278,17 @@ setup:
 ---
 synthetic_source:
   - requires:
-      cluster_features: ["gte_v8.4.0"]
-      reason: synthetic source introduced in 8.4.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               foo:
                 type: match_only_text
@@ -355,16 +356,17 @@ tsdb:
 ---
 synthetic_source with copy_to:
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_with_copy_to_and_doc_values_false"]
-      reason: requires copy_to support in synthetic source
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               foo:
                 type: match_only_text

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/rank_feature/30_synthetic_source.yml

@@ -1,15 +1,16 @@
 setup:
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_fallback"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               pagerank:
                 type: rank_feature

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/rank_features/20_synthetic_source.yml

@@ -1,15 +1,16 @@
 setup:
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_fallback"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               tags:
                 type: rank_features

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/search-as-you-type/30_synthetic_source.yml

@@ -1,15 +1,16 @@
 setup:
   - requires:
-      cluster_features: ["mapper.track_ignored_source"]
-      reason: requires tracking ignored source
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a_field:
                 type: search_as_you_type

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/token_count/10_basic.yml

@@ -36,15 +36,17 @@
 ---
 "Synthetic source":
   - requires:
-      cluster_features: ["mapper.track_ignored_source"]
-      reason: requires tracking ignored source
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index:  test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               count:
                 type: token_count

modules/parent-join/src/yamlRestTest/resources/rest-api-spec/test/60_synthetic_source.yml

@@ -1,15 +1,16 @@
 supported:
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_fallback"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               join_field:
                 type: join

modules/percolator/src/yamlRestTest/resources/rest-api-spec/test/10_basic.yml

@@ -130,16 +130,17 @@
 ---
 "Synthetic source":
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_fallback"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: queries_index
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               query:
                 type: percolator

modules/reindex/src/yamlRestTest/resources/rest-api-spec/test/reindex/110_synthetic_source.yml

@@ -1,11 +1,16 @@
 setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword

modules/reindex/src/yamlRestTest/resources/rest-api-spec/test/update_by_query/100_synthetic_source.yml

@@ -1,11 +1,16 @@
 update:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword

modules/runtime-fields-common/src/yamlRestTest/resources/rest-api-spec/test/runtime_fields/270_synthetic_source.yml

@@ -1,16 +1,17 @@
 ---
 keywords:
   - requires:
-      cluster_features: ["gte_v7.12.0"]
-      reason: Runtime mappings support was added in 7.12
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: index1
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               field1:
                 type: keyword
@@ -69,16 +70,17 @@ keywords:
 ---
 doubles:
   - requires:
-      cluster_features: ["gte_v7.12.0"]
-      reason: Runtime mappings support was added in 7.12
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: index1
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               field1:
                 type: double

plugins/mapper-annotated-text/src/yamlRestTest/resources/rest-api-spec/test/mapper_annotatedtext/20_synthetic_source.yml

@@ -1,8 +1,8 @@
 ---
 setup:
   - requires:
-      cluster_features: ["mapper.annotated_text.synthetic_source"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
 ---
 stored annotated_text field:
@@ -10,9 +10,10 @@ stored annotated_text field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -40,9 +41,10 @@ annotated_text field with keyword multi-field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -72,9 +74,10 @@ multiple values in stored annotated_text field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -102,9 +105,10 @@ multiple values in annotated_text field with keyword multi-field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -135,9 +139,10 @@ multiple values in annotated_text field with stored keyword multi-field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -169,9 +174,10 @@ multiple values in stored annotated_text field with keyword multi-field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text
@@ -202,9 +208,10 @@ fallback synthetic source:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               annotated_text:
                 type: annotated_text

plugins/mapper-murmur3/src/yamlRestTest/resources/rest-api-spec/test/mapper_murmur3/10_basic.yml

@@ -129,14 +129,18 @@ setup:
 
 ---
 "Murmur3 docvalue_fields api with synthetic source":
+  - requires:
+      cluster_features: ["mapper.source.mode_from_index_setting"]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test_synthetic_source
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               foo:
                 type: keyword

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/get/100_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 keyword:
   - requires:
       cluster_features: ["gte_v8.4.0"]
@@ -7,9 +13,10 @@ keyword:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -48,9 +55,8 @@ fetch without refresh also produces synthetic source:
           settings:
             index:
               refresh_interval: -1
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               obj:
                 properties:
@@ -90,9 +96,10 @@ force_synthetic_source_ok:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: stored
           mappings:
-            _source:
-              mode: stored
             properties:
               obj:
                 properties:
@@ -139,9 +146,10 @@ stored text:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               text:
                 type: text
@@ -212,9 +220,10 @@ stored keyword:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -253,9 +262,10 @@ doc values keyword with ignore_above:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -336,9 +346,10 @@ stored keyword with ignore_above:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -421,9 +432,10 @@ indexed dense vectors:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -465,9 +477,10 @@ non-indexed dense vectors:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -508,9 +521,10 @@ _source filtering:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -550,9 +564,9 @@ _doc_count:
       indices.create:
         index: test
         body:
-          mappings:
-            _source:
-              mode: synthetic
+          settings:
+            index:
+              mapping.source.mode: synthetic
 
   # with _doc_count
   - do:
@@ -679,9 +693,10 @@ fields with ignore_malformed:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               ip:
                 type: ip
@@ -914,9 +929,10 @@ flattened field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               flattened:
                 type: flattened
@@ -1006,9 +1022,10 @@ flattened field with ignore_above:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               field:
                 type: flattened
@@ -1061,9 +1078,10 @@ flattened field with ignore_above and arrays:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               field:
                 type: flattened
@@ -1117,9 +1135,10 @@ completion:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               completion:
                 type: completion

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/indices.create/20_synthetic_source.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 object with unmapped fields:
   - requires:
@@ -11,13 +16,11 @@ object with unmapped fields:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 total_fields:
                   ignore_dynamic_beyond_limit: true
                   limit: 1
-
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -64,13 +67,12 @@ unmapped arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 total_fields:
                   ignore_dynamic_beyond_limit: true
                   limit: 1
 
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -111,13 +113,12 @@ nested object with unmapped fields:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 total_fields:
                   ignore_dynamic_beyond_limit: true
                   limit: 3
 
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -163,13 +164,12 @@ empty object with unmapped fields:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 total_fields:
                   ignore_dynamic_beyond_limit: true
                   limit: 3
 
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -205,9 +205,10 @@ disabled root object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             enabled: false
 
   - do:
@@ -242,9 +243,10 @@ disabled object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 enabled: false
@@ -279,9 +281,10 @@ disabled object contains array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 enabled: false
@@ -319,9 +322,10 @@ disabled subobject:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -357,9 +361,10 @@ disabled subobject with array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -396,9 +401,10 @@ mixed disabled and enabled objects:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -442,9 +448,10 @@ object with dynamic override:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path_no:
                 dynamic: false
@@ -489,9 +496,10 @@ subobject with dynamic override:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -537,9 +545,10 @@ object array in object with dynamic override:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -591,9 +600,10 @@ value array in object with dynamic override:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path_no:
                 dynamic: false
@@ -634,9 +644,10 @@ nested object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               nested_field:
                 type: nested
@@ -679,9 +690,10 @@ nested object next to regular:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               path:
                 properties:
@@ -725,9 +737,10 @@ nested object with disabled:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               obj_field:
                 properties:
@@ -813,9 +826,10 @@ doubly nested object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               obj_field:
                 properties:
@@ -908,9 +922,10 @@ subobjects auto:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             subobjects: auto
             properties:
               id:
@@ -996,9 +1011,10 @@ synthetic_source with copy_to:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               number:
                 type: integer
@@ -1132,9 +1148,10 @@ synthetic_source with disabled doc_values:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               number:
                 type: integer
@@ -1215,9 +1232,10 @@ fallback synthetic_source for text field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               text:
                 type: text
@@ -1249,9 +1267,10 @@ synthetic_source with copy_to and ignored values:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1317,9 +1336,10 @@ synthetic_source with copy_to field having values in source:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1380,9 +1400,10 @@ synthetic_source with ignored source field using copy_to:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1444,9 +1465,10 @@ synthetic_source with copy_to field from dynamic template having values in sourc
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             dynamic_templates:
               - copy_template:
                   match: "k"
@@ -1541,9 +1563,10 @@ synthetic_source with copy_to and invalid values for copy:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1577,9 +1600,10 @@ synthetic_source with copy_to pointing inside object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1681,9 +1705,10 @@ synthetic_source with copy_to pointing to ambiguous field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               k:
                 type: keyword
@@ -1728,9 +1753,10 @@ synthetic_source with copy_to pointing to ambiguous field and subobjects false:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             subobjects: false
             properties:
               k:
@@ -1776,9 +1802,10 @@ synthetic_source with copy_to pointing to ambiguous field and subobjects auto:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             subobjects: auto
             properties:
               k:
@@ -1825,9 +1852,10 @@ synthetic_source with copy_to pointing at dynamic field:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1911,9 +1939,10 @@ synthetic_source with copy_to pointing inside dynamic object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/indices.create/21_synthetic_source_stored.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 object param - store complex object:
   - requires:
@@ -8,9 +13,10 @@ object param - store complex object:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -72,9 +78,10 @@ object param - object array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -136,9 +143,10 @@ object param - object array within array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               stored:
                 synthetic_source_keep: arrays
@@ -179,9 +187,10 @@ object param - no object array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               stored:
                 synthetic_source_keep: arrays
@@ -221,9 +230,10 @@ object param - field ordering in object array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a:
                 type: keyword
@@ -270,9 +280,10 @@ object param - nested object array next to other fields:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a:
                 type: keyword
@@ -326,9 +337,10 @@ object param - nested object with stored array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -378,9 +390,10 @@ index param - nested array within array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -428,9 +441,9 @@ index param - nested array within array - disabled second pass:
             index:
               synthetic_source:
                 enable_second_doc_parsing_pass: false
+              mapping.source.mode: synthetic
+
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -478,9 +491,8 @@ stored field under object with store_array_source:
             index:
               sort.field: "name"
               sort.order: "asc"
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -525,9 +537,10 @@ field param - keep root array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -582,9 +595,10 @@ field param - keep nested array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -650,9 +664,10 @@ field param - keep root singleton fields:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -739,9 +754,10 @@ field param - keep nested singleton fields:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -820,9 +836,10 @@ field param - nested array within array:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -866,10 +883,9 @@ index param - root arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -945,10 +961,9 @@ index param - dynamic root arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               id:
                 type: integer
@@ -998,10 +1013,9 @@ index param - object array within array:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               stored:
                 properties:
@@ -1048,10 +1062,9 @@ index param - no object array:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               stored:
                 properties:
@@ -1093,10 +1106,9 @@ index param - field ordering:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a:
                 type: keyword
@@ -1144,10 +1156,9 @@ index param - nested arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a:
                 type: keyword
@@ -1212,10 +1223,9 @@ index param - nested object with stored array:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -1264,10 +1274,9 @@ index param - flattened fields:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 synthetic_source_keep: arrays
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/indices.put_mapping/10_basic.yml

@@ -145,41 +145,19 @@
   - is_false: test_index.mappings.properties.foo.meta.bar
   - match: { test_index.mappings.properties.foo.meta.baz: "quux" }
 
----
-"disabling synthetic source fails":
-  - requires:
-      cluster_features: ["gte_v8.4.0"]
-      reason:      "Added in 8.4.0"
-
-  - do:
-      indices.create:
-        index: test_index
-        body:
-          mappings:
-            _source:
-              mode: synthetic
-
-  - do:
-      catch: /Cannot update parameter \[mode\] from \[synthetic\] to \[stored\]/
-      indices.put_mapping:
-        index: test_index
-        body:
-          _source:
-            mode: stored
-
 ---
 "enabling synthetic source from explicit succeeds":
   - requires:
-      cluster_features: [ "gte_v8.4.0" ]
-      reason:      "Added in 8.4.0"
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test_index
         body:
-          mappings:
-            _source:
-              mode: stored
+          settings:
+            index:
+              mapping.source.mode: stored
 
   - do:
       indices.put_mapping:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/logsdb/20_source_mapping.yml

@@ -1,9 +1,10 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 synthetic _source is default:
-  - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new validation logic
-
   - do:
       indices.create:
         index: test-default-source
@@ -19,10 +20,6 @@ synthetic _source is default:
 
 ---
 stored _source mode is supported:
-  - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new validation logic
-
   - do:
       indices.create:
         index: test-stored-source
@@ -30,9 +27,7 @@ stored _source mode is supported:
           settings:
             index:
               mode: logsdb
-          mappings:
-            _source:
-              mode: stored
+              mapping.source.mode: stored
   - do:
       indices.get:
         index: test-stored-source
@@ -41,10 +36,6 @@ stored _source mode is supported:
 
 ---
 disabled _source is not supported:
-  - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new error message
-
   - do:
       catch: bad_request
       indices.create:
@@ -69,9 +60,7 @@ disabled _source is not supported:
           settings:
             index:
               mode: logsdb
-          mappings:
-            _source:
-              mode: disabled
+              mapping.source.mode: disabled
 
   - match: { error.type: "mapper_parsing_exception" }
   - match: { error.root_cause.0.type: "mapper_parsing_exception" }
@@ -79,10 +68,6 @@ disabled _source is not supported:
 
 ---
 include/exclude is not supported with synthetic _source:
-  - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new validation logic
-
   - do:
       catch: '/filtering the stored _source is incompatible with synthetic source/'
       indices.create:
@@ -109,10 +94,6 @@ include/exclude is not supported with synthetic _source:
 
 ---
 include/exclude is supported with stored _source:
-  - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new validation logic
-
   - do:
       indices.create:
         index: test-includes
@@ -120,9 +101,9 @@ include/exclude is supported with stored _source:
           settings:
             index:
               mode: logsdb
+              mapping.source.mode: stored
           mappings:
             _source:
-              mode: stored
               includes: [a]
 
   - do:
@@ -139,9 +120,9 @@ include/exclude is supported with stored _source:
           settings:
             index:
               mode: logsdb
+              mapping.source.mode: stored
           mappings:
             _source:
-              mode: stored
               excludes: [b]
 
   - do:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/mget/90_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 keyword:
   - requires:
       cluster_features: ["gte_v8.4.0"]
@@ -7,9 +13,10 @@ keyword:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -62,9 +69,9 @@ keyword with normalizer:
                   type: custom
                   filter:
                     - lowercase
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword
@@ -144,9 +151,10 @@ stored text:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               text:
                 type: text
@@ -193,9 +201,10 @@ force_synthetic_source_ok:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: stored
           mappings:
-            _source:
-              mode: stored
             properties:
               obj:
                 properties:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.highlight/50_synthetic_source.yml

@@ -1,7 +1,7 @@
 setup:
   - requires:
-      cluster_features: ["gte_v8.4.0"]
-      reason: introduced in 8.4.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
@@ -9,9 +9,9 @@ setup:
         body:
           settings:
             number_of_shards: 1
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               foo:
                 type: keyword
@@ -21,6 +21,7 @@ setup:
                     index_options: positions
                   vectors:
                     type: text
+                    store: false
                     term_vector: with_positions_offsets
                   positions:
                     type: text

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/90_sparse_vector.yml

@@ -387,16 +387,17 @@
 "sparse_vector synthetic source":
 
   - requires:
-      cluster_features: ["mapper.source.synthetic_source_fallback"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               ml.tokens:
                 type: sparse_vector

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search/350_binary_field.yml

@@ -49,15 +49,17 @@
 ---
 "binary synthetic source":
   - requires:
-      cluster_features: "gte_v8.15.0"
-      reason: synthetic source support introduced in 8.15
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               binary:
                 type: binary

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search/400_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 keyword:
   - requires:
       cluster_features: ["gte_v8.4.0"]
@@ -7,9 +13,10 @@ keyword:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -44,9 +51,10 @@ stored text:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               text:
                 type: text
@@ -83,8 +91,6 @@ stored keyword:
         index: test
         body:
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -120,9 +126,10 @@ stored keyword without sibling fields:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -165,9 +172,10 @@ force_synthetic_source_ok:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: stored
           mappings:
-            _source:
-              mode: stored
             properties:
               obj:
                 properties:
@@ -218,9 +226,10 @@ doc values keyword with ignore_above:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -286,9 +295,10 @@ stored keyword with ignore_above:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -356,9 +366,10 @@ _source filtering:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -397,9 +408,9 @@ _doc_count:
       indices.create:
         index: test
         body:
-          mappings:
-            _source:
-              mode: synthetic
+          settings:
+            index:
+              mapping.source.mode: synthetic
 
   - do:
       index:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search/540_ignore_above_synthetic_source.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 ignore_above mapping level setting:
   - requires:
@@ -10,10 +15,9 @@ ignore_above mapping level setting:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 ignore_above: 10
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword
@@ -53,10 +57,9 @@ ignore_above mapping level setting on arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 ignore_above: 10
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword
@@ -97,10 +100,9 @@ ignore_above mapping overrides setting:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 ignore_above: 10
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword
@@ -143,10 +145,9 @@ ignore_above mapping overrides setting on arrays:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 ignore_above: 10
           mappings:
-            _source:
-              mode: synthetic
             properties:
               keyword:
                 type: keyword

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/tsdb/20_mapping.yml

@@ -427,8 +427,8 @@ nested fields:
 ---
 "Synthetic source":
   - requires:
-      cluster_features: ["gte_v8.10.0"]
-      reason: Synthetic source shows up in the mapping in 8.10
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
@@ -458,8 +458,8 @@ nested fields:
 ---
 stored source is supported:
   - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new validation logic
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
@@ -472,9 +472,9 @@ stored source is supported:
               time_series:
                 start_time: 2021-04-28T00:00:00Z
                 end_time: 2021-04-29T00:00:00Z
+              mapping:
+                source.mode: stored
           mappings:
-            _source:
-              mode: stored
             properties:
               "@timestamp":
                 type: date
@@ -495,8 +495,8 @@ stored source is supported:
 ---
 disabled source is not supported:
   - requires:
-      cluster_features: ["mapper.source.remove_synthetic_source_only_validation"]
-      reason: requires new error message
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       catch: bad_request
@@ -510,9 +510,9 @@ disabled source is not supported:
               time_series:
                 start_time: 2021-04-28T00:00:00Z
                 end_time: 2021-04-29T00:00:00Z
+              mapping:
+                source.mode: disabled
           mappings:
-            _source:
-              mode: disabled
             properties:
               "@timestamp":
                 type: date

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/update/100_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 keyword:
   - requires:
       cluster_features: ["gte_v8.4.0"]
@@ -7,9 +13,10 @@ keyword:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               kwd:
                 type: keyword
@@ -65,9 +72,10 @@ stored text:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               text:
                 type: text

server/src/main/java/org/elasticsearch/index/mapper/MapperFeatures.java

@@ -63,6 +63,7 @@ public class MapperFeatures implements FeatureSpecification {
             RangeFieldMapper.DATE_RANGE_INDEXING_FIX,
             IgnoredSourceFieldMapper.DONT_EXPAND_DOTS_IN_IGNORED_SOURCE,
             SourceFieldMapper.REMOVE_SYNTHETIC_SOURCE_ONLY_VALIDATION,
+            SourceFieldMapper.SOURCE_MODE_FROM_INDEX_SETTING,
             IgnoredSourceFieldMapper.IGNORED_SOURCE_AS_TOP_LEVEL_METADATA_ARRAY_FIELD,
             IgnoredSourceFieldMapper.ALWAYS_STORE_OBJECT_ARRAYS_IN_NESTED_OBJECTS,
             MapperService.LOGSDB_DEFAULT_IGNORE_DYNAMIC_BEYOND_LIMIT

server/src/main/java/org/elasticsearch/index/mapper/SourceFieldMapper.java

@@ -54,6 +54,7 @@ public class SourceFieldMapper extends MetadataFieldMapper {
     public static final NodeFeature REMOVE_SYNTHETIC_SOURCE_ONLY_VALIDATION = new NodeFeature(
         "mapper.source.remove_synthetic_source_only_validation"
     );
+    public static final NodeFeature SOURCE_MODE_FROM_INDEX_SETTING = new NodeFeature("mapper.source.mode_from_index_setting");
 
     public static final String NAME = "_source";
     public static final String RECOVERY_SOURCE_NAME = "_recovery_source";

x-pack/plugin/logsdb/src/yamlRestTest/resources/rest-api-spec/test/20_ignored_source.yml

@@ -2,13 +2,18 @@
 setup:
   - skip:
       features: headers
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               object:
                 enabled: false

x-pack/plugin/mapper-constant-keyword/src/yamlRestTest/resources/rest-api-spec/test/20_synthetic_source.yml

@@ -1,15 +1,16 @@
 constant_keyword:
   - requires:
-      cluster_features: ["gte_v8.4.0"]
-      reason: introduced in 8.4.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               const_kwd:
                 type: constant_keyword

x-pack/plugin/mapper-unsigned-long/src/yamlRestTest/resources/rest-api-spec/test/80_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 synthetic source:
   - requires:
       cluster_features: ["mapper.source.synthetic_source_with_copy_to_and_doc_values_false"]
@@ -7,9 +13,10 @@ synthetic source:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -52,9 +59,10 @@ synthetic source with copy_to:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -111,9 +119,10 @@ synthetic source with disabled doc_values:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword

x-pack/plugin/mapper-version/src/yamlRestTest/resources/rest-api-spec/test/40_synthetic_source.yml

@@ -1,15 +1,16 @@
 setup:
   - requires:
-      cluster_features: ["gte_v8.5.0"]
-      reason: "synthetic source support added in 8.5.0"
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index:  test1
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               ver:
                 type: version
@@ -76,9 +77,10 @@ synthetic source with copy_to:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               ver:
                 type: version

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/aggregate-metrics/100_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 aggregate_metric_double:
   - requires:
       cluster_features: ["gte_v8.5.0"]
@@ -7,9 +13,10 @@ aggregate_metric_double:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               metric:
                 type: aggregate_metric_double
@@ -62,9 +69,10 @@ aggregate_metric_double with ignore_malformed:
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               metric:
                 type: aggregate_metric_double

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/analytics/histogram.yml

@@ -175,16 +175,17 @@ setup:
 ---
 histogram with synthetic source:
   - requires:
-      cluster_features: ["gte_v8.5.0"]
-      reason: introduced in 8.5.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: histo_synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               latency:
                 type: histogram
@@ -221,16 +222,17 @@ histogram with synthetic source:
 ---
 histogram with synthetic source and zero counts:
   - requires:
-      cluster_features: ["gte_v8.5.0"]
-      reason: introduced in 8.5.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: histo_synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               latency:
                 type: histogram
@@ -310,16 +312,17 @@ histogram with large count values:
 ---
 histogram with synthetic source and ignore_malformed:
   - requires:
-      cluster_features: ["mapper.track_ignored_source"]
-      reason: introduced in 8.15.0
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: histo_synthetic
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               latency:
                 type: histogram

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/enrich/40_synthetic_source.yml

@@ -1,12 +1,17 @@
 ---
 setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: source
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               baz:
                 type: keyword

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/30_types.yml

@@ -805,13 +805,18 @@ text:
 
 ---
 synthetic _source text stored:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index:  test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               card:
                 type: text
@@ -836,13 +841,18 @@ synthetic _source text stored:
 
 ---
 synthetic _source text with parent keyword:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index:  test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               card:
                 type: keyword

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/esql/80_text.yml

@@ -477,13 +477,18 @@ setup:
 
 ---
 "text with synthetic source":
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: test2
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               "emp_no":
                 type: long
@@ -522,13 +527,18 @@ setup:
 
 ---
 "stored text with synthetic source":
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
   - do:
       indices.create:
         index: test2
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               "emp_no":
                 type: long

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/searchable_snapshots/20_synthetic_source.yml

@@ -1,8 +1,8 @@
 ---
 setup:
   - requires:
-      cluster_features: ["gte_v8.5.0"]
-      reason:  added in 8.5
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
@@ -11,9 +11,9 @@ setup:
           settings:
             number_of_shards:   1
             number_of_replicas: 0
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               obj:
                 properties:

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/security/authz_api_keys/30_field_level_security_synthetic_source.yml

@@ -2,6 +2,9 @@
 setup:
   - skip:
       features: headers
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       cluster.health:
@@ -13,9 +16,10 @@ Filter single field:
       indices.create:
         index: index_fls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -75,9 +79,10 @@ Filter fields in object:
       indices.create:
         index: index_fls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -142,9 +147,10 @@ Fields under a disabled object - uses _ignored_source:
       indices.create:
         index: index_fls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -236,12 +242,11 @@ Dynamic fields beyond limit - uses _ignored_source:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 total_fields:
                   ignore_dynamic_beyond_limit: true
                   limit: 2
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -301,9 +306,10 @@ Field with ignored_malformed:
       indices.create:
         index: index_fls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/security/authz_api_keys/40_document_level_security_synthetic_source.yml

@@ -2,6 +2,9 @@
 setup:
   - skip:
       features: headers
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       cluster.health:
@@ -13,9 +16,10 @@ Filter on single field:
       indices.create:
         index: index_dls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -95,9 +99,10 @@ Filter on nested field:
       indices.create:
         index: index_dls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -178,9 +183,10 @@ Filter on object with stored source:
       indices.create:
         index: index_dls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -258,9 +264,10 @@ Filter on field within a disabled object:
       indices.create:
         index: index_dls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -335,9 +342,10 @@ Filter on field with ignored_malformed:
       indices.create:
         index: index_dls
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/snapshot/10_basic.yml

@@ -95,17 +95,19 @@ setup:
 "Failed to snapshot indices with synthetic source":
   - skip:
       features: ["allowed_warnings"]
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
 
   - do:
       indices.create:
         index: test_synthetic
         body:
-          mappings:
-            _source:
-              mode: synthetic
           settings:
             number_of_shards:   1
             number_of_replicas: 0
+            index:
+              mapping.source.mode: synthetic
 
   - do:
       snapshot.create:

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/spatial/140_synthetic_source.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 "geo_shape":
   - requires:
@@ -8,9 +13,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               shape:
                 type: geo_shape
@@ -74,9 +80,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               shape:
                 type: geo_shape
@@ -157,9 +164,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               shape:
                 type: shape
@@ -223,9 +231,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               shape:
                 type: shape
@@ -306,9 +315,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               point:
                 type: geo_point
@@ -422,9 +432,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               geo_point:
                 type: geo_point
@@ -501,9 +512,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               point:
                 type: point
@@ -597,9 +609,10 @@
       indices.create:
         index: test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               point:
                 type: point

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/transform/preview_transforms_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 simple:
   - skip:
       features: headers
@@ -6,9 +12,10 @@ simple:
       indices.create:
         index: airline-data
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               time:
                 type: date

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/wildcard/30_ignore_above_synthetic_source.yml

@@ -1,3 +1,8 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
 ---
 wildcard field type ignore_above:
   - requires:
@@ -10,10 +15,9 @@ wildcard field type ignore_above:
           settings:
             index:
               mapping:
+                source.mode: synthetic
                 ignore_above: 10
           mappings:
-            _source:
-              mode: synthetic
             properties:
               a_wildcard:
                 type: wildcard

x-pack/plugin/wildcard/src/yamlRestTest/resources/rest-api-spec/test/30_synthetic_source.yml

@@ -1,3 +1,9 @@
+setup:
+  - requires:
+      cluster_features: [ "mapper.source.mode_from_index_setting" ]
+      reason: "Source mode configured through index setting"
+
+---
 synthetic source:
   - requires:
       cluster_features: ["mapper.source.synthetic_source_with_copy_to_and_doc_values_false"]
@@ -7,9 +13,10 @@ synthetic source:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword
@@ -48,9 +55,10 @@ synthetic source with copy_to:
       indices.create:
         index: synthetic_source_test
         body:
+          settings:
+            index:
+              mapping.source.mode: synthetic
           mappings:
-            _source:
-              mode: synthetic
             properties:
               name:
                 type: keyword