[Transform] Add delete_dest_index parameter to the Delete Transform API (#94162)

docs/changelog/94162.yaml

@@ -0,0 +1,5 @@
+pr: 94162
+summary: Add `delete_destination_index` parameter to the `Delete Transform API`
+area: Transform
+type: enhancement
+issues: []

docs/reference/transform/apis/delete-transform.asciidoc

@@ -36,6 +36,11 @@ include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-id]
 current state. The default value is `false`, meaning that the {transform} must be
 `stopped` before it can be deleted.
 
+`delete_dest_index`::
+(Optional, Boolean) When `true`, the destination index is deleted together with
+the {transform}. The default value is `false`, meaning that the destination
+index will not be deleted.
+
 `timeout`::
 (Optional, time)
 Period to wait for a response. If no response is received before the timeout

rest-api-spec/src/main/resources/rest-api-spec/api/transform.delete_transform.json

@@ -31,6 +31,11 @@
         "required":false,
         "description":"When `true`, the transform is deleted regardless of its current state. The default value is `false`, meaning that the transform must be `stopped` before it can be deleted."
       },
+      "delete_dest_index":{
+        "type":"boolean",
+        "required":false,
+        "description":"When `true`, the destination index is deleted together with the transform. The default value is `false`, meaning that the destination index will not be deleted."
+      },
       "timeout":{
         "type":"time",
         "required":false,

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/TransformField.java

@@ -36,6 +36,7 @@ public final class TransformField {
     public static final ParseField METADATA = new ParseField("_meta");
     public static final ParseField FREQUENCY = new ParseField("frequency");
     public static final ParseField FORCE = new ParseField("force");
+    public static final ParseField DELETE_DEST_INDEX = new ParseField("delete_dest_index");
     public static final ParseField MAX_PAGE_SEARCH_SIZE = new ParseField("max_page_search_size");
     public static final ParseField DOCS_PER_SECOND = new ParseField("docs_per_second");
     public static final ParseField DATES_AS_EPOCH_MILLIS = new ParseField("dates_as_epoch_millis");

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/transform/action/DeleteTransformAction.java

@@ -6,6 +6,7 @@
  */
 package org.elasticsearch.xpack.core.transform.action;
 
+import org.elasticsearch.TransportVersion;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionType;
 import org.elasticsearch.action.support.master.AcknowledgedRequest;
@@ -31,17 +32,24 @@ public class DeleteTransformAction extends ActionType<AcknowledgedResponse> {
     public static class Request extends AcknowledgedRequest<Request> {
         private final String id;
         private final boolean force;
+        private final boolean deleteDestIndex;
 
-        public Request(String id, boolean force, TimeValue timeout) {
+        public Request(String id, boolean force, boolean deleteDestIndex, TimeValue timeout) {
             super(timeout);
             this.id = ExceptionsHelper.requireNonNull(id, TransformField.ID.getPreferredName());
             this.force = force;
+            this.deleteDestIndex = deleteDestIndex;
         }
 
         public Request(StreamInput in) throws IOException {
             super(in);
             id = in.readString();
             force = in.readBoolean();
+            if (in.getTransportVersion().onOrAfter(TransportVersion.V_8_8_0)) {
+                deleteDestIndex = in.readBoolean();
+            } else {
+                deleteDestIndex = false;
+            }
         }
 
         public String getId() {
@@ -52,11 +60,18 @@ public class DeleteTransformAction extends ActionType<AcknowledgedResponse> {
             return force;
         }
 
+        public boolean isDeleteDestIndex() {
+            return deleteDestIndex;
+        }
+
         @Override
         public void writeTo(StreamOutput out) throws IOException {
             super.writeTo(out);
             out.writeString(id);
             out.writeBoolean(force);
+            if (out.getTransportVersion().onOrAfter(TransportVersion.V_8_8_0)) {
+                out.writeBoolean(deleteDestIndex);
+            }
         }
 
         @Override
@@ -67,7 +82,7 @@ public class DeleteTransformAction extends ActionType<AcknowledgedResponse> {
         @Override
         public int hashCode() {
             // the base class does not implement hashCode, therefore we need to hash timeout ourselves
-            return Objects.hash(timeout(), id, force);
+            return Objects.hash(timeout(), id, force, deleteDestIndex);
         }
 
         @Override
@@ -81,7 +96,10 @@ public class DeleteTransformAction extends ActionType<AcknowledgedResponse> {
             }
             Request other = (Request) obj;
             // the base class does not implement equals, therefore we need to check timeout ourselves
-            return Objects.equals(id, other.id) && force == other.force && timeout().equals(other.timeout());
+            return Objects.equals(id, other.id)
+                && force == other.force
+                && deleteDestIndex == other.deleteDestIndex
+                && timeout().equals(other.timeout());
         }
     }
 }

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/transform/action/DeleteTransformActionRequestTests.java

@@ -15,7 +15,12 @@ import org.elasticsearch.xpack.core.transform.action.DeleteTransformAction.Reque
 public class DeleteTransformActionRequestTests extends AbstractWireSerializingTestCase<Request> {
     @Override
     protected Request createTestInstance() {
-        return new Request(randomAlphaOfLengthBetween(1, 20), randomBoolean(), TimeValue.parseTimeValue(randomTimeValue(), "timeout"));
+        return new Request(
+            randomAlphaOfLengthBetween(1, 20),
+            randomBoolean(),
+            randomBoolean(),
+            TimeValue.parseTimeValue(randomTimeValue(), "timeout")
+        );
     }
 
     @Override
@@ -27,15 +32,17 @@ public class DeleteTransformActionRequestTests extends AbstractWireSerializingTe
     protected Request mutateInstance(Request instance) {
         String id = instance.getId();
         boolean force = instance.isForce();
+        boolean deleteDestIndex = instance.isDeleteDestIndex();
         TimeValue timeout = instance.timeout();
 
-        switch (between(0, 2)) {
+        switch (between(0, 3)) {
             case 0 -> id += randomAlphaOfLengthBetween(1, 5);
             case 1 -> force ^= true;
-            case 2 -> timeout = new TimeValue(timeout.duration() + randomLongBetween(1, 5), timeout.timeUnit());
+            case 2 -> deleteDestIndex ^= true;
+            case 3 -> timeout = new TimeValue(timeout.duration() + randomLongBetween(1, 5), timeout.timeUnit());
             default -> throw new AssertionError("Illegal randomization branch");
         }
 
-        return new Request(id, force, timeout);
+        return new Request(id, force, deleteDestIndex, timeout);
     }
 }

x-pack/plugin/transform/qa/single-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/transform/integration/TransformDeleteIT.java

@@ -0,0 +1,193 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.transform.integration;
+
+import org.apache.http.HttpHost;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.ResponseException;
+import org.elasticsearch.client.RestClient;
+import org.elasticsearch.client.RestClientBuilder;
+import org.elasticsearch.common.settings.Settings;
+import org.junit.Before;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Locale;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+
+public class TransformDeleteIT extends TransformRestTestCase {
+
+    private static final String TEST_USER_NAME = "transform_user";
+    private static final String TEST_ADMIN_USER_NAME_1 = "transform_admin_1";
+    private static final String BASIC_AUTH_VALUE_TRANSFORM_ADMIN_1 = basicAuthHeaderValue(
+        TEST_ADMIN_USER_NAME_1,
+        TEST_PASSWORD_SECURE_STRING
+    );
+    private static final String DATA_ACCESS_ROLE = "test_data_access";
+
+    private static boolean indicesCreated = false;
+
+    // preserve indices in order to reuse source indices in several test cases
+    @Override
+    protected boolean preserveIndicesUponCompletion() {
+        return true;
+    }
+
+    @Override
+    protected boolean enableWarningsCheck() {
+        return false;
+    }
+
+    @Override
+    protected RestClient buildClient(Settings settings, HttpHost[] hosts) throws IOException {
+        RestClientBuilder builder = RestClient.builder(hosts);
+        configureClient(builder, settings);
+        builder.setStrictDeprecationMode(false);
+        return builder.build();
+    }
+
+    @Before
+    public void createIndexes() throws IOException {
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME);
+        setupUser(TEST_USER_NAME, Arrays.asList("transform_user", DATA_ACCESS_ROLE));
+        setupUser(TEST_ADMIN_USER_NAME_1, Arrays.asList("transform_admin", DATA_ACCESS_ROLE));
+
+        // it's not possible to run it as @BeforeClass as clients aren't initialized then, so we need this little hack
+        if (indicesCreated) {
+            return;
+        }
+
+        createReviewsIndex();
+        indicesCreated = true;
+    }
+
+    public void testDeleteDoesNotDeleteDestinationIndexByDefault() throws Exception {
+        String transformId = "transform-1";
+        String transformDest = transformId + "_idx";
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest);
+
+        createTransform(transformId, transformDest);
+        assertFalse(indexExists(transformDest));
+
+        startTransform(transformId);
+        waitForTransformCheckpoint(transformId, 1);
+        stopTransform(transformId, false);
+        assertTrue(indexExists(transformDest));
+
+        deleteTransform(transformId);
+        assertTrue(indexExists(transformDest));
+    }
+
+    public void testDeleteWithParamDeletesAutoCreatedDestinationIndex() throws Exception {
+        String transformId = "transform-2";
+        String transformDest = transformId + "_idx";
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest);
+
+        createTransform(transformId, transformDest);
+        assertFalse(indexExists(transformDest));
+
+        startTransform(transformId);
+        waitForTransformCheckpoint(transformId, 1);
+
+        stopTransform(transformId, false);
+        assertTrue(indexExists(transformDest));
+
+        deleteTransform(transformId, true);
+        assertFalse(indexExists(transformDest));
+    }
+
+    public void testDeleteWithParamDeletesManuallyCreatedDestinationIndex() throws Exception {
+        String transformId = "transform-3";
+        String transformDest = transformId + "_idx";
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest);
+
+        createIndex(transformDest);
+        assertTrue(indexExists(transformDest));
+
+        createTransform(transformId, transformDest);
+
+        startTransform(transformId);
+        waitForTransformCheckpoint(transformId, 1);
+
+        stopTransform(transformId, false);
+        assertTrue(indexExists(transformDest));
+
+        deleteTransform(transformId, true);
+        assertFalse(indexExists(transformDest));
+    }
+
+    public void testDeleteWithParamDoesNotDeleteAlias() throws Exception {
+        String transformId = "transform-4";
+        String transformDest = transformId + "_idx";
+        String transformDestAlias = transformId + "_alias";
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest, transformDestAlias);
+
+        createIndex(transformDest, null, null, "\"" + transformDestAlias + "\": { \"is_write_index\": true }");
+        assertTrue(indexExists(transformDest));
+        assertTrue(indexExists(transformDestAlias));
+
+        createTransform(transformId, transformDestAlias);
+
+        startTransform(transformId);
+        waitForTransformCheckpoint(transformId, 1);
+
+        stopTransform(transformId, false);
+        assertTrue(indexExists(transformDest));
+
+        ResponseException e = expectThrows(ResponseException.class, () -> deleteTransform(transformId, true));
+        assertThat(
+            e.getMessage(),
+            containsString(
+                String.format(
+                    Locale.ROOT,
+                    "The provided expression [%s] matches an alias, specify the corresponding concrete indices instead.",
+                    transformDestAlias
+                )
+            )
+        );
+    }
+
+    private void createTransform(String transformId, String destIndex) throws IOException {
+        final Request createTransformRequest = createRequestWithAuth(
+            "PUT",
+            getTransformEndpoint() + transformId,
+            BASIC_AUTH_VALUE_TRANSFORM_ADMIN_1
+        );
+        String config = String.format(Locale.ROOT, """
+            {
+              "dest": {
+                "index": "%s"
+              },
+              "source": {
+                "index": "%s"
+              },
+              "pivot": {
+                "group_by": {
+                  "reviewer": {
+                    "terms": {
+                      "field": "user_id"
+                    }
+                  }
+                },
+                "aggregations": {
+                  "avg_rating": {
+                    "avg": {
+                      "field": "stars"
+                    }
+                  }
+                }
+              }
+            }""", destIndex, REVIEWS_INDEX_NAME);
+        createTransformRequest.setJsonEntity(config);
+        Map<String, Object> createTransformResponse = entityAsMap(client().performRequest(createTransformRequest));
+        assertThat(createTransformResponse.get("acknowledged"), equalTo(Boolean.TRUE));
+    }
+}

x-pack/plugin/transform/qa/single-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/transform/integration/TransformPivotRestSpecialCasesIT.java

@@ -10,17 +10,22 @@ package org.elasticsearch.xpack.transform.integration;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
 import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.ResponseException;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.xcontent.support.XContentMapValues;
+import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.rest.action.admin.indices.RestPutIndexTemplateAction;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.junit.Before;
 
 import java.io.IOException;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 
 import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
+import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
 
@@ -360,6 +365,83 @@ public class TransformPivotRestSpecialCasesIT extends TransformRestTestCase {
         }
     }
 
+    public void testDataStreamUnsupportedAsDestIndex() throws Exception {
+        String transformId = "transform-data-stream-unsupported-as-dest";
+        String sourceIndex = REVIEWS_INDEX_NAME;
+        String dataStreamIndexTemplate = transformId + "_it";
+        String destDataStream = transformId + "_ds";
+
+        // Create transform
+        final Request createTransformRequest = new Request("PUT", getTransformEndpoint() + transformId);
+        createTransformRequest.setJsonEntity(Strings.format("""
+            {
+              "source": {
+                "index": "%s"
+              },
+              "dest": {
+                "index": "%s"
+              },
+              "frequency": "1m",
+              "pivot": {
+                "group_by": {
+                  "user_id": {
+                    "terms": {
+                      "field": "user_id"
+                    }
+                  }
+                },
+                "aggregations": {
+                  "stars_sum": {
+                    "sum": {
+                      "field": "stars"
+                    }
+                  },
+                  "bs": {
+                    "bucket_selector": {
+                      "buckets_path": {
+                        "stars_sum": "stars_sum.value"
+                      },
+                      "script": "params.stars_sum > 20"
+                    }
+                  }
+                }
+              }
+            }""", sourceIndex, destDataStream));
+        Map<String, Object> createTransformResponse = entityAsMap(client().performRequest(createTransformRequest));
+        assertThat(createTransformResponse.get("acknowledged"), equalTo(Boolean.TRUE));
+
+        // Create index template for data stream
+        Request createIndexTemplateRequest = new Request("PUT", "_index_template/" + dataStreamIndexTemplate);
+        createIndexTemplateRequest.setJsonEntity(String.format(Locale.ROOT, """
+            {
+              "index_patterns": [ "%s*" ],
+              "data_stream": {}
+            }
+            """, destDataStream));
+        Response createIndexTemplateResponse = client().performRequest(createIndexTemplateRequest);
+        assertThat(createIndexTemplateResponse.getStatusLine().getStatusCode(), is(equalTo(RestStatus.OK.getStatus())));
+
+        // Create data stream
+        Request createDataStreamRequest = new Request("PUT", "_data_stream/" + destDataStream);
+        Response createDataStreamResponse = client().performRequest(createDataStreamRequest);
+        assertThat(createDataStreamResponse.getStatusLine().getStatusCode(), is(equalTo(RestStatus.OK.getStatus())));
+
+        // Try starting the transform, it fails because destination index cannot be created from the data stream template
+        ResponseException e = expectThrows(ResponseException.class, () -> startTransform(transformId));
+        assertThat(
+            e.getMessage(),
+            containsString(
+                String.format(
+                    Locale.ROOT,
+                    "cannot create index with name [%s], because it matches with template [%s] that creates data streams only, "
+                        + "use create data stream api instead",
+                    destDataStream,
+                    dataStreamIndexTemplate
+                )
+            )
+        );
+    }
+
     private void verifyDestIndexHitsCount(String sourceIndex, String transformId, int maxPageSearchSize, long expectedDestIndexCount)
         throws Exception {
         String transformIndex = transformId;

x-pack/plugin/transform/qa/single-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/transform/integration/TransformResetIT.java

@@ -69,9 +69,8 @@ public class TransformResetIT extends TransformRestTestCase {
         indicesCreated = true;
     }
 
-    @SuppressWarnings("unchecked")
     public void testReset() throws Exception {
-        String transformId = "old_transform";
+        String transformId = "transform-1";
         String transformDest = transformId + "_idx";
         setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest);
 
@@ -80,7 +79,60 @@ public class TransformResetIT extends TransformRestTestCase {
             getTransformEndpoint() + transformId,
             BASIC_AUTH_VALUE_TRANSFORM_ADMIN_1
         );
-        String config = Strings.format("""
+        String config = createConfig(transformDest);
+        createTransformRequest.setJsonEntity(config);
+        Map<String, Object> createTransformResponse = entityAsMap(client().performRequest(createTransformRequest));
+        assertThat(createTransformResponse.get("acknowledged"), equalTo(Boolean.TRUE));
+
+        // Verify that reset works on a new transform
+        resetTransform(transformId, false);
+
+        // Start the transform
+        startTransform(transformId);
+
+        // Verify that reset doesn't work when the transform is running
+        ResponseException e = expectThrows(ResponseException.class, () -> resetTransform(transformId, false));
+        assertThat(e.getMessage(), containsString("Cannot reset transform [transform-1] as the task is running. Stop the task first"));
+
+        // Verify that reset with [force=true] works even when the transform is running
+        resetTransform(transformId, true);
+
+        // Start the transform again
+        startTransform(transformId);
+
+        // Verify that reset works on a stopped transform
+        stopTransform(transformId, false);
+        resetTransform(transformId, false);
+    }
+
+    public void testResetDeletesDestinationIndex() throws Exception {
+        String transformId = "transform-2";
+        String transformDest = transformId + "_idx";
+        setupDataAccessRole(DATA_ACCESS_ROLE, REVIEWS_INDEX_NAME, transformDest);
+
+        final Request createTransformRequest = createRequestWithAuth(
+            "PUT",
+            getTransformEndpoint() + transformId,
+            BASIC_AUTH_VALUE_TRANSFORM_ADMIN_1
+        );
+        String config = createConfig(transformDest);
+        createTransformRequest.setJsonEntity(config);
+        Map<String, Object> createTransformResponse = entityAsMap(client().performRequest(createTransformRequest));
+        assertThat(createTransformResponse.get("acknowledged"), equalTo(Boolean.TRUE));
+
+        assertFalse(indexExists(transformDest));
+
+        startTransform(transformId);
+        waitForTransformCheckpoint(transformId, 1);
+        stopTransform(transformId, false);
+        assertTrue(indexExists(transformDest));
+
+        resetTransform(transformId, false);
+        assertFalse(indexExists(transformDest));
+    }
+
+    private static String createConfig(String transformDestIndex) {
+        return Strings.format("""
             {
               "dest": {
                 "index": "%s"
@@ -104,29 +156,6 @@ public class TransformResetIT extends TransformRestTestCase {
                   }
                 }
               }
-            }""", transformDest, REVIEWS_INDEX_NAME);
-        createTransformRequest.setJsonEntity(config);
-        Map<String, Object> createTransformResponse = entityAsMap(client().performRequest(createTransformRequest));
-        assertThat(createTransformResponse.get("acknowledged"), equalTo(Boolean.TRUE));
-
-        // Verify that reset works on a new transform
-        resetTransform(transformId, false);
-
-        // Start the transform
-        startTransform(transformId);
-
-        // Verify that reset doesn't work when the transform is running
-        ResponseException e = expectThrows(ResponseException.class, () -> resetTransform(transformId, false));
-        assertThat(e.getMessage(), containsString("Cannot reset transform [old_transform] as the task is running. Stop the task first"));
-
-        // Verify that reset with [force=true] works even when the transform is running
-        resetTransform(transformId, true);
-
-        // Start the transform again
-        startTransform(transformId);
-
-        // Verify that reset works on a stopped transform
-        stopTransform(transformId, false);
-        resetTransform(transformId, false);
+            }""", transformDestIndex, REVIEWS_INDEX_NAME);
     }
 }

x-pack/plugin/transform/qa/single-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/transform/integration/TransformRestTestCase.java

@@ -584,8 +584,15 @@ public abstract class TransformRestTestCase extends ESRestTestCase {
     }
 
     protected static void deleteTransform(String transformId) throws IOException {
+        deleteTransform(transformId, false);
+    }
+
+    protected static void deleteTransform(String transformId, boolean deleteDestIndex) throws IOException {
         Request request = new Request("DELETE", getTransformEndpoint() + transformId);
         request.addParameter("ignore", "404"); // Ignore 404s because they imply someone was racing us to delete this
+        if (deleteDestIndex) {
+            request.addParameter(TransformField.DELETE_DEST_INDEX.getPreferredName(), Boolean.TRUE.toString());
+        }
         adminClient().performRequest(request);
     }
 
@@ -611,7 +618,7 @@ public abstract class TransformRestTestCase extends ESRestTestCase {
         Map<?, ?> transformStatsAsMap = (Map<?, ?>) ((List<?>) entityAsMap(statsResponse).get("transforms")).get(0);
 
         // assert that the transform did not fail
-        assertNotEquals("failed", XContentMapValues.extractValue("state", transformStatsAsMap));
+        assertNotEquals("Stats were: " + transformStatsAsMap, "failed", XContentMapValues.extractValue("state", transformStatsAsMap));
         return (int) XContentMapValues.extractValue("checkpointing.last.checkpoint", transformStatsAsMap);
     }
 
@@ -623,7 +630,7 @@ public abstract class TransformRestTestCase extends ESRestTestCase {
               "indices": [
                 {
                   "names": [ %s ],
-                  "privileges": [ "create_index", "read", "write", "view_index_metadata" ]
+                  "privileges": [ "create_index", "delete_index", "read", "write", "view_index_metadata" ]
                 }
               ]
             }""", indicesStr));

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportDeleteTransformAction.java

@@ -10,6 +10,8 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.action.admin.indices.delete.DeleteIndexAction;
+import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.action.support.master.AcknowledgedTransportMasterNodeAction;
@@ -20,20 +22,26 @@ import org.elasticsearch.cluster.block.ClusterBlockLevel;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.Tuple;
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.tasks.Task;
+import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 import org.elasticsearch.xpack.core.transform.action.DeleteTransformAction;
 import org.elasticsearch.xpack.core.transform.action.DeleteTransformAction.Request;
 import org.elasticsearch.xpack.core.transform.action.StopTransformAction;
+import org.elasticsearch.xpack.core.transform.transforms.TransformConfig;
 import org.elasticsearch.xpack.transform.TransformServices;
 import org.elasticsearch.xpack.transform.notifications.TransformAuditor;
+import org.elasticsearch.xpack.transform.persistence.SeqNoPrimaryTermAndIndex;
 import org.elasticsearch.xpack.transform.persistence.TransformConfigManager;
 import org.elasticsearch.xpack.transform.transforms.TransformTask;
 
 import static org.elasticsearch.xpack.core.ClientHelper.TRANSFORM_ORIGIN;
 import static org.elasticsearch.xpack.core.ClientHelper.executeAsyncWithOrigin;
+import static org.elasticsearch.xpack.core.ClientHelper.executeWithHeadersAsync;
 
 public class TransportDeleteTransformAction extends AcknowledgedTransportMasterNodeAction<Request> {
 
@@ -70,6 +78,7 @@ public class TransportDeleteTransformAction extends AcknowledgedTransportMasterN
 
     @Override
     protected void masterOperation(Task task, Request request, ClusterState state, ActionListener<AcknowledgedResponse> listener) {
+        final TaskId parentTaskId = new TaskId(clusterService.localNode().getId(), task.getId());
         final boolean transformIsRunning = TransformTask.getTransformTask(request.getId(), state) != null;
         if (transformIsRunning && request.isForce() == false) {
             listener.onFailure(
@@ -81,8 +90,9 @@ public class TransportDeleteTransformAction extends AcknowledgedTransportMasterN
             return;
         }
 
-        ActionListener<StopTransformAction.Response> stopTransformActionListener = ActionListener.wrap(
-            unusedStopResponse -> transformConfigManager.deleteTransform(request.getId(), ActionListener.wrap(r -> {
+        // <3> Delete transform config
+        ActionListener<AcknowledgedResponse> deleteDestIndexListener = ActionListener.wrap(
+            unusedAcknowledgedResponse -> transformConfigManager.deleteTransform(request.getId(), ActionListener.wrap(r -> {
                 logger.debug("[{}] deleted transform", request.getId());
                 auditor.info(request.getId(), "Deleted transform.");
                 listener.onResponse(AcknowledgedResponse.of(r));
@@ -90,12 +100,63 @@ public class TransportDeleteTransformAction extends AcknowledgedTransportMasterN
             listener::onFailure
         );
 
+        // <2> Delete destination index if requested
+        ActionListener<StopTransformAction.Response> stopTransformActionListener = ActionListener.wrap(unusedStopResponse -> {
+            if (request.isDeleteDestIndex()) {
+                deleteDestinationIndex(parentTaskId, request.getId(), request.timeout(), deleteDestIndexListener);
+            } else {
+                deleteDestIndexListener.onResponse(null);
+            }
+        }, listener::onFailure);
+
+        // <1> Stop transform if it's currently running
+        stopTransform(transformIsRunning, parentTaskId, request.getId(), request.timeout(), stopTransformActionListener);
+    }
+
+    private void stopTransform(
+        boolean transformIsRunning,
+        TaskId parentTaskId,
+        String transformId,
+        TimeValue timeout,
+        ActionListener<StopTransformAction.Response> listener
+    ) {
         if (transformIsRunning == false) {
-            stopTransformActionListener.onResponse(null);
+            listener.onResponse(null);
             return;
         }
-        StopTransformAction.Request stopTransformRequest = new StopTransformAction.Request(request.getId(), true, true, null, true, false);
-        executeAsyncWithOrigin(client, TRANSFORM_ORIGIN, StopTransformAction.INSTANCE, stopTransformRequest, stopTransformActionListener);
+        StopTransformAction.Request stopTransformRequest = new StopTransformAction.Request(transformId, true, true, timeout, true, false);
+        stopTransformRequest.setParentTask(parentTaskId);
+        executeAsyncWithOrigin(client, TRANSFORM_ORIGIN, StopTransformAction.INSTANCE, stopTransformRequest, listener);
+    }
+
+    private void deleteDestinationIndex(
+        TaskId parentTaskId,
+        String transformId,
+        TimeValue timeout,
+        ActionListener<AcknowledgedResponse> listener
+    ) {
+        // <2> Delete destination index
+        ActionListener<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> getTransformConfigurationListener = ActionListener.wrap(
+            transformConfigAndVersion -> {
+                TransformConfig config = transformConfigAndVersion.v1();
+                String destIndex = config.getDestination().getIndex();
+                DeleteIndexRequest deleteDestIndexRequest = new DeleteIndexRequest(destIndex);
+                deleteDestIndexRequest.timeout(timeout);
+                deleteDestIndexRequest.setParentTask(parentTaskId);
+                executeWithHeadersAsync(
+                    config.getHeaders(),
+                    TRANSFORM_ORIGIN,
+                    client,
+                    DeleteIndexAction.INSTANCE,
+                    deleteDestIndexRequest,
+                    listener
+                );
+            },
+            listener::onFailure
+        );
+
+        // <1> Fetch transform configuration
+        transformConfigManager.getTransformConfigurationForUpdate(transformId, getTransformConfigurationListener);
     }
 
     @Override

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/action/TransportResetTransformAction.java

@@ -102,9 +102,7 @@ public class TransportResetTransformAction extends AcknowledgedTransportMasterNo
             return;
         }
 
-        final SetOnce<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> transformConfigAndVersionHolder = new SetOnce<>();
-
-        // <6> Reset transform
+        // <4> Reset transform
         ActionListener<TransformUpdater.UpdateResult> updateTransformListener = ActionListener.wrap(
             unusedUpdateResult -> transformConfigManager.resetTransform(request.getId(), ActionListener.wrap(resetResponse -> {
                 logger.debug("[{}] reset transform", request.getId());
@@ -114,8 +112,9 @@ public class TransportResetTransformAction extends AcknowledgedTransportMasterNo
             listener::onFailure
         );
 
-        // <5> Upgrade transform to the latest version
-        ActionListener<AcknowledgedResponse> deleteDestIndexListener = ActionListener.wrap(unusedDeleteDestIndexResponse -> {
+        // <3> Upgrade transform to the latest version
+        ActionListener<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> deleteDestIndexListener = ActionListener.wrap(
+            transformConfigAndVersion -> {
                 final ClusterState clusterState = clusterService.state();
                 TransformUpdater.updateTransform(
                     securityContext,
@@ -124,45 +123,22 @@ public class TransportResetTransformAction extends AcknowledgedTransportMasterNo
                     settings,
                     client,
                     transformConfigManager,
-                transformConfigAndVersionHolder.get().v1(),
+                    transformConfigAndVersion.v1(),
                     TransformConfigUpdate.EMPTY,
-                transformConfigAndVersionHolder.get().v2(),
+                    transformConfigAndVersion.v2(),
                     false, // defer validation
                     false, // dry run
                     false, // check access
                     request.timeout(),
                     updateTransformListener
                 );
-        }, listener::onFailure);
-
-        // <4> Delete destination index if it was created by transform.
-        ActionListener<Boolean> isDestinationIndexCreatedByTransformListener = ActionListener.wrap(isDestinationIndexCreatedByTransform -> {
-            if (isDestinationIndexCreatedByTransform == false) {
-                // Destination index was created outside of transform, we don't delete it and just move on.
-                deleteDestIndexListener.onResponse(AcknowledgedResponse.TRUE);
-                return;
-            }
-            String destIndex = transformConfigAndVersionHolder.get().v1().getDestination().getIndex();
-            DeleteIndexRequest deleteDestIndexRequest = new DeleteIndexRequest(destIndex);
-            executeAsyncWithOrigin(client, TRANSFORM_ORIGIN, DeleteIndexAction.INSTANCE, deleteDestIndexRequest, deleteDestIndexListener);
-        }, listener::onFailure);
-
-        // <3> Check if the destination index was created by transform
-        ActionListener<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> getTransformConfigurationListener = ActionListener.wrap(
-            transformConfigAndVersion -> {
-                transformConfigAndVersionHolder.set(transformConfigAndVersion);
-                String destIndex = transformConfigAndVersion.v1().getDestination().getIndex();
-                TransformIndex.isDestinationIndexCreatedByTransform(client, destIndex, isDestinationIndexCreatedByTransformListener);
             },
             listener::onFailure
         );
 
-        // <2> Fetch transform configuration
+        // <2> Delete destination index if it was created by the transform
         ActionListener<StopTransformAction.Response> stopTransformActionListener = ActionListener.wrap(
-            unusedStopResponse -> transformConfigManager.getTransformConfigurationForUpdate(
-                request.getId(),
-                getTransformConfigurationListener
-            ),
+            unusedStopResponse -> deleteDestinationIndexIfCreatedByTheTransform(request.getId(), deleteDestIndexListener),
             listener::onFailure
         );
 
@@ -175,6 +151,44 @@ public class TransportResetTransformAction extends AcknowledgedTransportMasterNo
         executeAsyncWithOrigin(client, TRANSFORM_ORIGIN, StopTransformAction.INSTANCE, stopTransformRequest, stopTransformActionListener);
     }
 
+    private void deleteDestinationIndexIfCreatedByTheTransform(
+        String transformId,
+        ActionListener<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> listener
+    ) {
+        final SetOnce<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> transformConfigAndVersionHolder = new SetOnce<>();
+
+        // <4> Send the fetched config to the caller
+        ActionListener<AcknowledgedResponse> finalListener = ActionListener.wrap(
+            unusedDeleteIndexResponse -> listener.onResponse(transformConfigAndVersionHolder.get()),
+            listener::onFailure
+        );
+
+        // <3> Delete destination index if it was created by transform
+        ActionListener<Boolean> isDestinationIndexCreatedByTransformListener = ActionListener.wrap(isDestinationIndexCreatedByTransform -> {
+            if (isDestinationIndexCreatedByTransform == false) {
+                // Destination index was created outside of transform, we don't delete it and just move on.
+                finalListener.onResponse(AcknowledgedResponse.TRUE);
+                return;
+            }
+            String destIndex = transformConfigAndVersionHolder.get().v1().getDestination().getIndex();
+            DeleteIndexRequest deleteDestIndexRequest = new DeleteIndexRequest(destIndex);
+            executeAsyncWithOrigin(client, TRANSFORM_ORIGIN, DeleteIndexAction.INSTANCE, deleteDestIndexRequest, finalListener);
+        }, listener::onFailure);
+
+        // <2> Check if the destination index was created by transform
+        ActionListener<Tuple<TransformConfig, SeqNoPrimaryTermAndIndex>> getTransformConfigurationListener = ActionListener.wrap(
+            transformConfigAndVersion -> {
+                transformConfigAndVersionHolder.set(transformConfigAndVersion);
+                String destIndex = transformConfigAndVersion.v1().getDestination().getIndex();
+                TransformIndex.isDestinationIndexCreatedByTransform(client, destIndex, isDestinationIndexCreatedByTransformListener);
+            },
+            listener::onFailure
+        );
+
+        // <1> Fetch transform configuration
+        transformConfigManager.getTransformConfigurationForUpdate(transformId, getTransformConfigurationListener);
+    }
+
     @Override
     protected ClusterBlockException checkBlock(Request request, ClusterState state) {
         return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_READ);

x-pack/plugin/transform/src/main/java/org/elasticsearch/xpack/transform/rest/action/RestDeleteTransformAction.java

@@ -34,9 +34,10 @@ public class RestDeleteTransformAction extends BaseRestHandler {
 
         String id = restRequest.param(TransformField.ID.getPreferredName());
         boolean force = restRequest.paramAsBoolean(TransformField.FORCE.getPreferredName(), false);
+        boolean deleteDestIndex = restRequest.paramAsBoolean(TransformField.DELETE_DEST_INDEX.getPreferredName(), false);
         TimeValue timeout = restRequest.paramAsTime(TransformField.TIMEOUT.getPreferredName(), AcknowledgedRequest.DEFAULT_ACK_TIMEOUT);
 
-        DeleteTransformAction.Request request = new DeleteTransformAction.Request(id, force, timeout);
+        DeleteTransformAction.Request request = new DeleteTransformAction.Request(id, force, deleteDestIndex, timeout);
 
         return channel -> client.execute(DeleteTransformAction.INSTANCE, request, new RestToXContentListener<>(channel));
     }

x-pack/plugin/transform/src/test/java/org/elasticsearch/xpack/transform/rest/action/RestDeleteTransformActionTests.java

@@ -9,20 +9,47 @@ package org.elasticsearch.xpack.transform.rest.action;
 
 import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.common.bytes.BytesArray;
+import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.rest.RestChannel;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.test.rest.FakeRestRequest;
 import org.elasticsearch.xcontent.NamedXContentRegistry;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentType;
 import org.elasticsearch.xcontent.json.JsonXContent;
+import org.elasticsearch.xpack.core.transform.action.DeleteTransformAction;
+import org.junit.After;
+import org.junit.Before;
+
+import java.util.Map;
 
 import static org.hamcrest.Matchers.equalTo;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
 
 public class RestDeleteTransformActionTests extends ESTestCase {
 
+    private static final TimeValue DEFAULT_TIMEOUT = TimeValue.timeValueSeconds(30);
+
+    private final RestDeleteTransformAction handler = new RestDeleteTransformAction();
+    private RestChannel channel;
+    private NodeClient client;
+
+    @Before
+    public void initializeMocks() {
+        channel = mock(RestChannel.class);
+        client = mock(NodeClient.class);
+    }
+
+    @After
+    public void verifyNoMoreInteractionsWithClient() {
+        verifyNoMoreInteractions(client);
+    }
+
     public void testBodyRejection() throws Exception {
-        final RestDeleteTransformAction handler = new RestDeleteTransformAction();
         try (XContentBuilder builder = JsonXContent.contentBuilder()) {
             builder.startObject();
             {
@@ -33,12 +60,51 @@ public class RestDeleteTransformActionTests extends ESTestCase {
                 new BytesArray(builder.toString()),
                 XContentType.JSON
             ).build();
-            IllegalArgumentException e = expectThrows(
-                IllegalArgumentException.class,
-                () -> handler.prepareRequest(request, mock(NodeClient.class))
-            );
+            IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> handler.prepareRequest(request, client));
             assertThat(e.getMessage(), equalTo("delete transform requests can not have a request body"));
         }
     }
 
+    public void testDefaults() throws Exception {
+        FakeRestRequest request = new FakeRestRequest.Builder(NamedXContentRegistry.EMPTY).withParams(Map.of("id", "my-id")).build();
+        handler.handleRequest(request, channel, client);
+
+        DeleteTransformAction.Request expectedActionRequest = new DeleteTransformAction.Request("my-id", false, false, DEFAULT_TIMEOUT);
+        verify(client).execute(eq(DeleteTransformAction.INSTANCE), eq(expectedActionRequest), any());
+    }
+
+    public void testForce() throws Exception {
+        FakeRestRequest request = new FakeRestRequest.Builder(NamedXContentRegistry.EMPTY).withParams(
+            Map.of("id", "my-id", "force", "true")
+        ).build();
+        handler.handleRequest(request, channel, client);
+
+        DeleteTransformAction.Request expectedActionRequest = new DeleteTransformAction.Request("my-id", true, false, DEFAULT_TIMEOUT);
+        verify(client).execute(eq(DeleteTransformAction.INSTANCE), eq(expectedActionRequest), any());
+    }
+
+    public void testDeleteDestIndex() throws Exception {
+        FakeRestRequest request = new FakeRestRequest.Builder(NamedXContentRegistry.EMPTY).withParams(
+            Map.of("id", "my-id", "delete_dest_index", "true")
+        ).build();
+        handler.handleRequest(request, channel, client);
+
+        DeleteTransformAction.Request expectedActionRequest = new DeleteTransformAction.Request("my-id", false, true, DEFAULT_TIMEOUT);
+        verify(client).execute(eq(DeleteTransformAction.INSTANCE), eq(expectedActionRequest), any());
+    }
+
+    public void testTimeout() throws Exception {
+        FakeRestRequest request = new FakeRestRequest.Builder(NamedXContentRegistry.EMPTY).withParams(
+            Map.of("id", "my-id", "timeout", "45s")
+        ).build();
+        handler.handleRequest(request, channel, client);
+
+        DeleteTransformAction.Request expectedActionRequest = new DeleteTransformAction.Request(
+            "my-id",
+            false,
+            false,
+            TimeValue.timeValueSeconds(45)
+        );
+        verify(client).execute(eq(DeleteTransformAction.INSTANCE), eq(expectedActionRequest), any());
+    }
 }