Data stream support for get field mappings API (#58488) (#58766)

rest-api-spec/src/main/resources/rest-api-spec/test/indices.get_field_mapping/60_data_streams.yml

@@ -0,0 +1,38 @@
+---
+"Data streams":
+  - skip:
+      features: allowed_warnings
+      version: " - 7.99.99"
+      reason: "change to 7.8.99 after backport"
+
+  - do:
+      allowed_warnings:
+        - "index template [my-template1] has index patterns [simple-data-stream1] matching patterns from existing older templates [global] with patterns (global => [*]); this template [my-template1] will take precedence during new index creation"
+      indices.put_index_template:
+        name: my-template1
+        body:
+          index_patterns: [simple-data-stream1]
+          template:
+            mappings:
+              properties:
+                '@timestamp':
+                  type: date
+          data_stream:
+            timestamp_field: '@timestamp'
+
+  - do:
+      indices.create_data_stream:
+        name: simple-data-stream1
+  - is_true: acknowledged
+
+  - do:
+      indices.get_field_mapping:
+        index: simple-data-stream1
+        fields: foo
+
+  - is_true: \.ds-simple-data-stream1-000001
+
+  - do:
+      indices.delete_data_stream:
+        name: simple-data-stream1
+  - is_true: acknowledged

server/src/internalClusterTest/java/org/elasticsearch/indices/DataStreamIT.java

@@ -385,7 +385,7 @@ public class DataStreamIT extends ESIntegTestCase {
         verifyResolvability(dataStreamName, client().admin().indices().prepareRecoveries(dataStreamName), false);
         verifyResolvability(dataStreamName, client().admin().indices().prepareUpgradeStatus(dataStreamName), false);
         verifyResolvability(dataStreamName, getAliases(dataStreamName), true);
-        verifyResolvability(dataStreamName, getFieldMapping(dataStreamName), true);
+        verifyResolvability(dataStreamName, getFieldMapping(dataStreamName), false);
         verifyResolvability(dataStreamName, getMapping(dataStreamName), false);
         verifyResolvability(dataStreamName, getSettings(dataStreamName), false);
         verifyResolvability(dataStreamName, health(dataStreamName), false);
@@ -414,7 +414,7 @@ public class DataStreamIT extends ESIntegTestCase {
         verifyResolvability(wildcardExpression, client().admin().indices().prepareRecoveries(wildcardExpression), false);
         verifyResolvability(wildcardExpression, client().admin().indices().prepareUpgradeStatus(wildcardExpression), false);
         verifyResolvability(wildcardExpression, getAliases(wildcardExpression), true);
-        verifyResolvability(wildcardExpression, getFieldMapping(wildcardExpression), true);
+        verifyResolvability(wildcardExpression, getFieldMapping(wildcardExpression), false);
         verifyResolvability(wildcardExpression, getMapping(wildcardExpression), false);
         verifyResolvability(wildcardExpression, getSettings(wildcardExpression), false);
         verifyResolvability(wildcardExpression, health(wildcardExpression), false);

server/src/main/java/org/elasticsearch/action/admin/indices/mapping/get/TransportGetFieldMappingsAction.java

@@ -56,7 +56,7 @@ public class TransportGetFieldMappingsAction extends HandledTransportAction<GetF
     @Override
     protected void doExecute(Task task, GetFieldMappingsRequest request, final ActionListener<GetFieldMappingsResponse> listener) {
         ClusterState clusterState = clusterService.state();
-        String[] concreteIndices = indexNameExpressionResolver.concreteIndexNames(clusterState, request);
+        String[] concreteIndices = indexNameExpressionResolver.concreteIndexNames(clusterState, request, true);
         final AtomicInteger indexCounter = new AtomicInteger();
         final AtomicInteger completionCounter = new AtomicInteger(concreteIndices.length);
         final AtomicReferenceArray<Object> indexResponses = new AtomicReferenceArray<>(concreteIndices.length);