add flag for janusgraph optimisation

intg/src/main/java/org/apache/atlas/AtlasConfiguration.java

@@ -113,7 +113,16 @@ public enum AtlasConfiguration {
     HERACLES_API_SERVER_URL("atlas.heracles.api.service.url", "http://heracles-service.heracles.svc.cluster.local"),
 
     INDEXSEARCH_ASYNC_SEARCH_KEEP_ALIVE_TIME_IN_SECONDS("atlas.indexsearch.async.search.keep.alive.time.in.seconds", 300),
+
+    /**
+     *   hits elastic search async APU
+     */
     ENABLE_ASYNC_INDEXSEARCH("atlas.indexsearch.async.enable", false),
+
+    /***
+     *  enables parallel processing of janus graph vertices from cassandra
+     */
+    ENABLE_JANUS_GRAPH_OPTIMISATION("atlas.janus.graph.optimisation.enable", false),
     ATLAS_INDEXSEARCH_QUERY_SIZE_MAX_LIMIT("atlas.indexsearch.query.size.max.limit", 100000),
     ATLAS_INDEXSEARCH_LIMIT_UTM_TAGS("atlas.indexsearch.limit.ignore.utm.tags", ""),
     ATLAS_INDEXSEARCH_ENABLE_API_LIMIT("atlas.indexsearch.enable.api.limit", false),