Fix bulk upsert ignores the default_pipeline and final_pipeline when the auto-created index matches the index template

CHANGELOG.md

@@ -114,6 +114,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Removed
 
 ### Fixed
+- Fix bulk upsert ignores the default_pipeline and final_pipeline when auto-created index matches the index template ([#12891](https://github.com/opensearch-project/OpenSearch/pull/12891))
 
 ### Security
 

modules/ingest-common/src/yamlRestTest/resources/rest-api-spec/test/ingest/70_bulk.yml

@@ -41,6 +41,10 @@ teardown:
       ingest.delete_pipeline:
         id: "pipeline2"
         ignore: 404
+  - do:
+      indices.delete_index_template:
+        name: test_index_template_for_bulk
+        ignore: 404
 
 ---
 "Test bulk request without default pipeline":
@@ -144,3 +148,36 @@ teardown:
 
   - is_false: _source.field1
   - match: {_source.field2: value2}
+
+---
+"Test bulk upsert honors default_pipeline and final_pipeline when the auto-created index matches with the index template":
+  - skip:
+      version: " - 2.99.99"
+      reason: "fixed in 3.0.0"
+  - do:
+      indices.put_index_template:
+        name: test_for_bulk_upsert_index_template
+        body:
+          index_patterns: test_bulk_upsert_*
+          template:
+            settings:
+              number_of_shards:   1
+              number_of_replicas: 0
+              default_pipeline: pipeline1
+              final_pipeline: pipeline2
+
+  - do:
+      bulk:
+        refresh: true
+        body:
+          - '{"update": {"_index": "test_bulk_upsert_index", "_id": "test_id3"}}'
+          - '{"upsert": {"f1": "v2", "f2": 47}, "doc": {"x": 1}}'
+
+  - match: { errors: false }
+  - match: { items.0.update.result: created }
+
+  - do:
+      get:
+        index: test_bulk_upsert_index
+        id: test_id3
+  - match: { _source: {"f1": "v2", "f2": 47, "field1": "value1", "field2": "value2"}}

server/src/main/java/org/opensearch/ingest/IngestService.java

@@ -211,11 +211,18 @@ public static boolean resolvePipelines(
                     finalPipeline = IndexSettings.FINAL_PIPELINE.get(indexSettings);
                     indexRequest.setFinalPipeline(finalPipeline);
                 }
-            } else if (indexRequest.index() != null) {
+            } else if (indexRequest.index() != null || originalRequest != null && originalRequest.index() != null) {
                 // the index does not exist yet (and this is a valid request), so match index
                 // templates to look for pipelines in either a matching V2 template (which takes
                 // precedence), or if a V2 template does not match, any V1 templates
-                String v2Template = MetadataIndexTemplateService.findV2Template(metadata, indexRequest.index(), false);
+                String indexName;
+                if (indexRequest.index() != null) {
+                    indexName = indexRequest.index();
+                } else {
+                    assert originalRequest != null;
+                    indexName = originalRequest.index();
+                }
+                String v2Template = MetadataIndexTemplateService.findV2Template(metadata, indexName, false);
                 if (v2Template != null) {
                     Settings settings = MetadataIndexTemplateService.resolveSettings(metadata, v2Template);
                     if (IndexSettings.DEFAULT_PIPELINE.exists(settings)) {
@@ -229,11 +236,7 @@ public static boolean resolvePipelines(
                     indexRequest.setPipeline(defaultPipeline != null ? defaultPipeline : NOOP_PIPELINE_NAME);
                     indexRequest.setFinalPipeline(finalPipeline != null ? finalPipeline : NOOP_PIPELINE_NAME);
                 } else {
-                    List<IndexTemplateMetadata> templates = MetadataIndexTemplateService.findV1Templates(
-                        metadata,
-                        indexRequest.index(),
-                        null
-                    );
+                    List<IndexTemplateMetadata> templates = MetadataIndexTemplateService.findV1Templates(metadata, indexName, null);
                     // order of templates are highest order first
                     for (final IndexTemplateMetadata template : templates) {
                         final Settings settings = template.settings();

server/src/test/java/org/opensearch/ingest/IngestServiceTests.java

@@ -1582,6 +1582,14 @@ public void testResolveRequiredOrDefaultPipelineDefaultPipeline() {
         assertThat(result, is(true));
         assertThat(indexRequest.isPipelineResolved(), is(true));
         assertThat(indexRequest.getPipeline(), equalTo("default-pipeline"));
+
+        // index name matches with ITMD for bulk upsert
+        IndexRequest upsertRequest = new IndexRequest().source(emptyMap());
+        UpdateRequest updateRequest = new UpdateRequest("idx", "id1").upsert(upsertRequest).script(mockScript("1"));
+        result = IngestService.resolvePipelines(updateRequest, TransportBulkAction.getIndexWriteRequest(updateRequest), metadata);
+        assertThat(result, is(true));
+        assertThat(upsertRequest.isPipelineResolved(), is(true));
+        assertThat(upsertRequest.getPipeline(), equalTo("default-pipeline"));
     }
 
     public void testResolveFinalPipeline() {
@@ -1619,6 +1627,14 @@ public void testResolveFinalPipeline() {
         assertThat(indexRequest.isPipelineResolved(), is(true));
         assertThat(indexRequest.getPipeline(), equalTo("_none"));
         assertThat(indexRequest.getFinalPipeline(), equalTo("final-pipeline"));
+
+        // index name matches with ITMD for bulk upsert:
+        IndexRequest upsertRequest = new IndexRequest().source(emptyMap());
+        UpdateRequest updateRequest = new UpdateRequest("idx", "id1").upsert(upsertRequest).script(mockScript("1"));
+        result = IngestService.resolvePipelines(updateRequest, TransportBulkAction.getIndexWriteRequest(updateRequest), metadata);
+        assertThat(result, is(true));
+        assertThat(upsertRequest.isPipelineResolved(), is(true));
+        assertThat(upsertRequest.getFinalPipeline(), equalTo("final-pipeline"));
     }
 
     public void testResolveRequestOrDefaultPipelineAndFinalPipeline() {