create dummy SearchResponse instance for ElasticSearch test case

This will do what you want:

SearchShardTarget shardTarget = new SearchShardTarget("1", "monitoring", 1);
ShardSearchFailure[] shardFailures = new ShardSearchFailure[0];
float score = 0.2345f;

BytesReference source = new BytesArray("{\"@timestamp\":\"2014-08-20T15:43:20.762Z\",\"category_name\""
        + ":\"cat1111\",\"alert_message\":\"the new cpu threshold has been reached 80%\",\"alert_type\":"
        + "\"Critical\",\"view_mode\":\"unread\"}");

InternalSearchHit hit = new InternalSearchHit(1, "5YmRf-6OTvelt29V5dphmw", new StringText("quota-management"),
        null);
hit.shardTarget(shardTarget);
hit.sourceRef(source);
hit.score(score);

InternalSearchHit[] hits = new InternalSearchHit[]{hit}; 
InternalSearchHits internalSearchHits = new InternalSearchHits(hits, 28, score);
InternalSearchResponse internalSearchResponse = new InternalSearchResponse(internalSearchHits, null, null,
      null, false);

SearchResponse searchResponse = new SearchResponse(internalSearchResponse, "scrollId", 1, 1, 1000, 
        shardFailures);

If you call toString() on searchResponse it returns:

{
    "_scroll_id" : "scrollId",
    "took" : 1000,
    "timed_out" : false,
    "_shards" : {
        "total" : 1,
        "successful" : 1,
        "failed" : 0
    },
    "hits" : {
        "total" : 28,
        "max_score" : 0.2345,
        "hits" : [ {
            "_index" : "monitoring",
            "_type" : "quota-management",
            "_id" : "5YmRf-6OTvelt29V5dphmw",
            "_score" : 0.2345,
            "_source":{"@timestamp":"2014-08-20T15:43:20.762Z","category_name":"cat1111","alert_message":"the new cpu threshold has been reached 80%","alert_type":"Critical","view_mode":"unread"}
        } ]
    }
}