nit: Update deprecation message for _opendistro/_security/kibanainfo API (#5156)

Signed-off-by: shikharj05 <8859327+shikharj05@users.noreply.github.com>

Author: shikharj05

src/main/java/org/opensearch/security/rest/DashboardsInfoAction.java

@@ -51,13 +51,15 @@
 import static org.opensearch.rest.RestRequest.Method.GET;
 import static org.opensearch.rest.RestRequest.Method.POST;
 import static org.opensearch.security.dlic.rest.support.Utils.LEGACY_PLUGIN_ROUTE_PREFIX;
-import static org.opensearch.security.dlic.rest.support.Utils.OPENDISTRO_API_DEPRECATION_MESSAGE;
 import static org.opensearch.security.dlic.rest.support.Utils.PLUGIN_ROUTE_PREFIX;
 import static org.opensearch.security.dlic.rest.support.Utils.addDeprecatedRoutesPrefix;
 import static org.opensearch.security.dlic.rest.support.Utils.addRoutesPrefix;
 
 public class DashboardsInfoAction extends BaseRestHandler {
 
+    private static final String KIBANAINFO_ROUTE_DEPRECATION_MESSAGE =
+        "[_opendistro/_security/kibanainfo] is a deprecated endpoint path. Please use _plugins/_security/dashboardsinfo instead.";;
+
     private static final List<Route> routes = ImmutableList.<Route>builder()
         .addAll(
             addRoutesPrefix(ImmutableList.of(new Route(GET, "/dashboardsinfo"), new Route(POST, "/dashboardsinfo")), PLUGIN_ROUTE_PREFIX)
@@ -68,8 +70,8 @@ public class DashboardsInfoAction extends BaseRestHandler {
         .addAll(
             addDeprecatedRoutesPrefix(
                 ImmutableList.of(
-                    new DeprecatedRoute(GET, "/kibanainfo", OPENDISTRO_API_DEPRECATION_MESSAGE),
-                    new DeprecatedRoute(POST, "/kibanainfo", OPENDISTRO_API_DEPRECATION_MESSAGE)
+                    new DeprecatedRoute(GET, "/kibanainfo", KIBANAINFO_ROUTE_DEPRECATION_MESSAGE),
+                    new DeprecatedRoute(POST, "/kibanainfo", KIBANAINFO_ROUTE_DEPRECATION_MESSAGE)
                 ),
                 LEGACY_PLUGIN_ROUTE_PREFIX
             )