[Rule based auto-tagging] Add autotagging rule integration tests (#18550)

---------

Signed-off-by: Lingxi Chen <[email protected]>
Signed-off-by: Lindsay-00 <[email protected]>
Co-authored-by: Lingxi Chen <[email protected]>

Author: Lindsay-00

CHANGELOG.md

@@ -23,6 +23,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - 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))
+- [Rule based auto-tagging] Add Rule based auto-tagging IT ([#18550](https://github.com/opensearch-project/OpenSearch/pull/18550))
 
 ### Changed
 - Refactor `if-else` chains to use `Java 17 pattern matching switch expressions`(([#18965](https://github.com/opensearch-project/OpenSearch/pull/18965))

modules/autotagging-commons/common/src/main/java/org/opensearch/rule/action/UpdateRuleResponse.java

@@ -64,7 +64,7 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
     /**
      * rule getter
      */
-    Rule getRule() {
+    public Rule getRule() {
         return rule;
     }
 }