in src/main/groovy/com/epam/esp/elasticsearch/ElasticSearchHelper.groovy [97:105]
boolean isIndexExists(String indexName) {
IndexMetadata indexMetaData = client.admin().cluster()
.state(Requests.clusterStateRequest())
.actionGet()
.getState()
.getMetadata()
.index(indexName);
return (indexMetaData != null);
}