This might be expensive for large responses

[todo]

vermillion/api-server/src/main/java/vermillion/database/DbServiceImpl.java

Lines 107 to 112 in 41fbd91

	// TODO: This might be expensive for large responses
	for (int i = 0; i < responseHits.size(); i++) {
	observableEmitter.onNext(responseHits.getJsonObject(i).getJsonObject("_source"));
	}
	observableEmitter.onComplete();
	})

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This issue was generated by todo based on a TODO comment in 41fbd91 when #228 was merged. cc @datasetu.