fix count and custom label on runtime fields (#95019) (#95053)

src/plugins/data/common/index_patterns/index_patterns/__snapshots__/index_patterns.test.ts.snap

@@ -1,16 +1,50 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`IndexPatterns correctly composes runtime field 1`] = `
+FldList [
+  Object {
+    "aggregatable": true,
+    "conflictDescriptions": undefined,
+    "count": 5,
+    "customLabel": "A Runtime Field",
+    "esTypes": Array [
+      "keyword",
+    ],
+    "lang": undefined,
+    "name": "aRuntimeField",
+    "readFromDocValues": false,
+    "script": undefined,
+    "scripted": false,
+    "searchable": true,
+    "subType": undefined,
+    "type": "string",
+  },
+]
+`;
+
 exports[`IndexPatterns savedObjectToSpec 1`] = `
 Object {
   "allowNoIndex": undefined,
-  "fieldAttrs": Object {},
+  "fieldAttrs": Object {
+    "aRuntimeField": Object {
+      "count": 5,
+      "customLabel": "A Runtime Field",
+    },
+  },
   "fieldFormats": Object {
     "field": Object {},
   },
   "fields": Object {},
   "id": "id",
   "intervalName": undefined,
-  "runtimeFieldMap": Object {},
+  "runtimeFieldMap": Object {
+    "aRuntimeField": Object {
+      "script": Object {
+        "source": "emit('hello')",
+      },
+      "type": "keyword",
+    },
+  },
   "sourceFilters": Array [
     Object {
       "value": "item1",

src/plugins/data/common/index_patterns/index_patterns/index_patterns.test.ts

@@ -26,6 +26,25 @@ function setDocsourcePayload(id: string | null, providedPayload: any) {
   object = defaults(providedPayload || {}, stubbedSavedObjectIndexPattern(id));
 }
 
+const savedObject = {
+  id: 'id',
+  version: 'version',
+  attributes: {
+    title: 'kibana-*',
+    timeFieldName: '@timestamp',
+    fields: '[]',
+    sourceFilters: '[{"value":"item1"},{"value":"item2"}]',
+    fieldFormatMap: '{"field":{}}',
+    typeMeta: '{}',
+    type: '',
+    runtimeFieldMap:
+      '{"aRuntimeField": { "type": "keyword", "script": {"source": "emit(\'hello\')"}}}',
+    fieldAttrs: '{"aRuntimeField": { "count": 5, "customLabel": "A Runtime Field"}}',
+  },
+  type: 'index-pattern',
+  references: [],
+};
+
 describe('IndexPatterns', () => {
   let indexPatterns: IndexPatternsService;
   let savedObjectsClient: SavedObjectsClientCommon;
@@ -220,23 +239,14 @@ describe('IndexPatterns', () => {
   });
 
   test('savedObjectToSpec', () => {
-    const savedObject = {
-      id: 'id',
-      version: 'version',
-      attributes: {
-        title: 'kibana-*',
-        timeFieldName: '@timestamp',
-        fields: '[]',
-        sourceFilters: '[{"value":"item1"},{"value":"item2"}]',
-        fieldFormatMap: '{"field":{}}',
-        typeMeta: '{}',
-        type: '',
-      },
-      type: 'index-pattern',
-      references: [],
-    };
+    const spec = indexPatterns.savedObjectToSpec(savedObject);
+    expect(spec).toMatchSnapshot();
+  });
 
-    expect(indexPatterns.savedObjectToSpec(savedObject)).toMatchSnapshot();
+  test('correctly composes runtime field', async () => {
+    setDocsourcePayload('id', savedObject);
+    const indexPattern = await indexPatterns.get('id');
+    expect(indexPattern.fields).toMatchSnapshot();
   });
 
   test('failed requests are not cached', async () => {

src/plugins/data/common/index_patterns/index_patterns/index_patterns.ts

@@ -429,8 +429,9 @@ export class IndexPatternsService {
             runtimeField: value,
             aggregatable: true,
             searchable: true,
-            count: 0,
             readFromDocValues: false,
+            customLabel: spec.fieldAttrs?.[key]?.customLabel,
+            count: spec.fieldAttrs?.[key]?.count,
           };
         }
       }