Add new extensible method to DocRequest to specify type (opensearch-project#19313)

* Add new extensible method to DocRequest to specify type

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Add CHANGELOG entry

Signed-off-by: Craig Perkins <cwperx@amazon.com>

* Add CHANGELOG entry

Signed-off-by: Craig Perkins <cwperx@amazon.com>

---------

Signed-off-by: Craig Perkins <cwperx@amazon.com>

Author: cwperks

CHANGELOG.md

@@ -96,8 +96,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Publish transport-grpc-spi exposing QueryBuilderProtoConverter and QueryBuilderProtoConverterRegistry ([#18949](https://github.com/opensearch-project/OpenSearch/pull/18949))
 - Support system generated search pipeline. ([#19128](https://github.com/opensearch-project/OpenSearch/pull/19128))
 - Add `epoch_micros` date format ([#14669](https://github.com/opensearch-project/OpenSearch/issues/14669))
-- Grok processor supports capturing multiple values for same field name ([#18799](https://github.com/opensearch-project/OpenSearch/pull/18799)
+- Grok processor supports capturing multiple values for same field name ([#18799](https://github.com/opensearch-project/OpenSearch/pull/18799))
 - Upgrade opensearch-protobufs dependency to 0.13.0 and update transport-grpc module compatibility ([#19007](https://github.com/opensearch-project/OpenSearch/issues/19007))
+- Add new extensible method to DocRequest to specify type ([#19313](https://github.com/opensearch-project/OpenSearch/pull/19313))
 
 ### Changed
 - Refactor `if-else` chains to use `Java 17 pattern matching switch expressions`(([#18965](https://github.com/opensearch-project/OpenSearch/pull/18965))

server/src/main/java/org/opensearch/action/DocRequest.java

@@ -28,4 +28,18 @@ public interface DocRequest {
      * @return the id
      */
     String id();
+
+    /**
+     * Get the type of the request. This should match the action name prefix: i.e. indices:data/read/get
+     *
+     * Used in the context of resource sharing to specify the type of sharable resource.
+     *
+     * i.e. A report definition is sharable, so ActionRequests in the reporting plugin that
+     * pertain to a single report definition would override this to specify "report_definition"
+     *
+     * @return the type
+     */
+    default String type() {
+        return "indices";
+    }
 }