Handled default search pipeline for multiple indices

Signed-off-by: Owais Kazi <owaiskazi19@gmail.com>

Author: owaiskazi19

CHANGELOG.md

@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add an individual setting of rate limiter for segment replication ([#12959](https://github.com/opensearch-project/OpenSearch/pull/12959))
 - [Streaming Indexing] Ensure support of the new transport by security plugin ([#13174](https://github.com/opensearch-project/OpenSearch/pull/13174))
 - Add cluster setting to dynamically configure the buckets for filter rewrite optimization. ([#13179](https://github.com/opensearch-project/OpenSearch/pull/13179))
+- [Search Pipeline] Handle default pipeline for multiple indices ([#13276](https://github.com/opensearch-project/OpenSearch/pull/13276))
 
 ### Dependencies
 - Bump `org.apache.commons:commons-configuration2` from 2.10.0 to 2.10.1 ([#12896](https://github.com/opensearch-project/OpenSearch/pull/12896))

server/src/main/java/org/opensearch/action/search/TransportSearchAction.java

@@ -457,7 +457,7 @@ private void executeRequest(
             PipelinedRequest searchRequest;
             ActionListener<SearchResponse> listener;
             try {
-                searchRequest = searchPipelineService.resolvePipeline(originalSearchRequest);
+                searchRequest = searchPipelineService.resolvePipeline(originalSearchRequest, indexNameExpressionResolver);
                 listener = searchRequest.transformResponseListener(updatedListener);
             } catch (Exception e) {
                 updatedListener.onFailure(e);

server/src/main/java/org/opensearch/search/pipeline/SearchPipelineService.java

@@ -23,6 +23,7 @@
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.ClusterStateApplier;
 import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.IndexNameExpressionResolver;
 import org.opensearch.cluster.metadata.Metadata;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.service.ClusterManagerTaskKeys;
@@ -35,6 +36,7 @@
 import org.opensearch.common.xcontent.XContentHelper;
 import org.opensearch.core.action.ActionListener;
 import org.opensearch.core.common.io.stream.NamedWriteableRegistry;
+import org.opensearch.core.index.Index;
 import org.opensearch.core.service.ReportingService;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.env.Environment;
@@ -360,7 +362,7 @@ static ClusterState innerDelete(DeleteSearchPipelineRequest request, ClusterStat
         return newState.build();
     }
 
-    public PipelinedRequest resolvePipeline(SearchRequest searchRequest) {
+    public PipelinedRequest resolvePipeline(SearchRequest searchRequest, IndexNameExpressionResolver indexNameExpressionResolver) {
         Pipeline pipeline = Pipeline.NO_OP_PIPELINE;
 
         if (searchRequest.source() != null && searchRequest.source().searchPipelineSource() != null) {
@@ -390,13 +392,22 @@ public PipelinedRequest resolvePipeline(SearchRequest searchRequest) {
             if (searchRequest.pipeline() != null) {
                 // Named pipeline specified for the request
                 pipelineId = searchRequest.pipeline();
-            } else if (state != null && searchRequest.indices() != null && searchRequest.indices().length == 1) {
+            } else if (state != null && searchRequest.indices() != null) {
                 // Check for index default pipeline
-                IndexMetadata indexMetadata = state.metadata().index(searchRequest.indices()[0]);
-                if (indexMetadata != null) {
-                    Settings indexSettings = indexMetadata.getSettings();
-                    if (IndexSettings.DEFAULT_SEARCH_PIPELINE.exists(indexSettings)) {
-                        pipelineId = IndexSettings.DEFAULT_SEARCH_PIPELINE.get(indexSettings);
+                Index[] concreteIndices = indexNameExpressionResolver.concreteIndices(state, searchRequest);
+                for (Index index : concreteIndices) {
+                    IndexMetadata indexMetadata = state.metadata().index(index);
+                    if (indexMetadata != null) {
+                        Settings indexSettings = indexMetadata.getSettings();
+                        if (IndexSettings.DEFAULT_SEARCH_PIPELINE.exists(indexSettings)) {
+                            String currentPipelineId = IndexSettings.DEFAULT_SEARCH_PIPELINE.get(indexSettings);
+                            if (NOOP_PIPELINE_ID.equals(pipelineId)) {
+                                pipelineId = currentPipelineId;
+                            } else if (pipelineId.equals(currentPipelineId) == false) {
+                                pipelineId = NOOP_PIPELINE_ID;
+                                break;
+                            }
+                        }
                     }
                 }
             }