Update ActiveShardCount search_only mode condition

Signed-off-by: Prudhvi Godithi <[email protected]>

Author: prudhvigodithi

CHANGELOG.md

@@ -26,6 +26,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add GRPC DocumentService and Bulk endpoint ([#17727](https://github.com/opensearch-project/OpenSearch/pull/17727))
 - Added scale to zero (`search_only` mode) support for OpenSearch reader writer separation ([#17299](https://github.com/opensearch-project/OpenSearch/pull/17299)
 - [Star Tree] [Search] Resolving numeric range aggregation with metric aggregation using star-tree ([#17273](https://github.com/opensearch-project/OpenSearch/pull/17273))
+- Support `_close` and `_open` APIs for indices in `search_only` mode ([#17844](https://github.com/opensearch-project/OpenSearch/pull/17844))
 
 ### Changed
 - Migrate BC libs to their FIPS counterparts ([#14912](https://github.com/opensearch-project/OpenSearch/pull/14912))

server/src/main/java/org/opensearch/action/support/ActiveShardCount.java

@@ -179,12 +179,11 @@ public boolean enoughShardsActive(final ClusterState clusterState, final String.
             }
             assert indexRoutingTable != null;
 
-            boolean isSearchOnlyClusterBlockEnabled = indexMetadata.getSettings()
-                .getAsBoolean(IndexMetadata.INDEX_BLOCKS_SEARCH_ONLY_SETTING.getKey(), false);
-
-            if (isSearchOnlyClusterBlockEnabled == false && indexRoutingTable.allPrimaryShardsActive() == false) {
-                // all primary shards aren't active yet
-                return false;
+            if (indexRoutingTable.allPrimaryShardsActive() == false) {
+                if (indexMetadata.getSettings().getAsBoolean(IndexMetadata.INDEX_BLOCKS_SEARCH_ONLY_SETTING.getKey(), false) == false) {
+                    // all primary shards aren't active yet
+                    return false;
+                }
             }
             ActiveShardCount waitForActiveShards = this;
             if (waitForActiveShards == ActiveShardCount.DEFAULT) {