add group = org.opensearch.plugin (#578) (#579)

Signed-off-by: Prudhvi Godithi <[email protected]>
(cherry picked from commit 82173fb)

Co-authored-by: Prudhvi Godithi <[email protected]>

Author: opensearch-trigger-bot[bot]

build.gradle

@@ -88,6 +88,7 @@ publishing {
             pom {
                 name = "opensearch-knn"
                 description = "OpenSearch k-NN plugin"
+                groupId = "org.opensearch.plugin"
                 licenses {
                     license {
                         name = "The Apache License, Version 2.0"