Update group to groupId (#908)

Signed-off-by: Peng Huo <penghuo@gmail.com>

Author: penghuo

plugin/build.gradle

@@ -55,7 +55,7 @@ publishing {
             pom {
                 name = 'opensearch-sql'
                 description = 'OpenSearch SQL'
-                group = "org.opensearch.plugin"
+                groupId = "org.opensearch.plugin"
                 licenses {
                     license {
                         name = 'The Apache License, Version 2.0'