Add a check on SearchHits.getHits() length

Signed-off-by: Megha Goyal <[email protected]>

src/main/java/org/opensearch/securityanalytics/transport/TransportCorrelateFindingAction.java

@@ -262,7 +262,7 @@ public void onResponse(SearchResponse response) {
 
                         SearchHits hits = response.getHits();
                         // Detectors Index hits count could be more even if we fetch one
-                        if (hits.getTotalHits().value >= 1) {
+                        if (hits.getTotalHits().value >= 1 && hits.getHits().length > 0) {
                             try {
                                 SearchHit hit = hits.getAt(0);