@Test
public void testDoExtractResponse() throws Exception {

	final String message = "this is a test";
	BasicHttpEntity entity = new BasicHttpEntity();
	try(ByteArrayInputStream bis = new ByteArrayInputStream(message.getBytes())) {
		entity.setContent(bis);
	}
	catch (IOException e) {
		throw e;
	}
	String responseMessage = ElasticSearchUtils.doExtractResponse(200, entity);
	assertEquals("expect the entity to be equal after extraction", message, responseMessage);
}