private static final String ACTIVE_SHARDS = "active_shards";
    private static final String RELOCATING_SHARDS = "relocating_shards";
    private static final String INITIALIZING_SHARDS = "initializing_shards";
    private static final String UNASSIGNED_SHARDS = "unassigned_shards";

    private final int status;

    private final String clusterName;

    private final String clusterStatus;

        assertTrue(mockConfig.getApiPingEsFieldSet().contains("active_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("relocating_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("initializing_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("unassigned_shards"));
        assertTrue(mockConfig.getApiPingEsFieldSet().contains("delayed_unassigned_shards"));

        @Override
        public String getApiPingSearchEngineFields() {
            return "cluster_name,status,timed_out,number_of_nodes,number_of_data_nodes,active_primary_shards,active_shards,relocating_shards,initializing_shards,unassigned_shards,delayed_unassigned_shards,number_of_pending_tasks,number_of_in_flight_fetch,task_max_waiting_in_queue_millis,active_shards_percent_as_number";
        }

        @Override

            engineObj.activeShardsPercent = response.getActiveShardsPercent();
            engineObj.relocatingShards = response.getRelocatingShards();
            engineObj.initializingShards = response.getInitializingShards();
            engineObj.unassignedShards = response.getUnassignedShards();
            engineObj.delayedUnassignedShards = response.getDelayedUnassignedShards();