.post("/" + getIndexName() + "/_search") //
                .body(query)
                .execute()) {
            if (response.getHttpStatusCode() == 200) {
                final Map<String, Object> result = parseJson(response.getContentAsString());
                final Map<String, Object> hits = getMapValue(result, "hits");
                if (hits != null) {

        final Map<String, Object> result = coordinatorHelper.parseJson(json);
        assertEquals("heartbeat", result.get("type"));
        assertEquals("test", result.get("instanceId"));
        assertEquals(12345, result.get("createdTime"));
    }

    @Test
    public void test_parseJson_empty() {
        final Map<String, Object> result = coordinatorHelper.parseJson("{}");
        assertNotNull(result);

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