body = {"query": {"bool":
                {"must": [
                    {"match": {
                        "{}".format(key_columns[0]): {"query": elem["{}".format(key_columns[0])], "operator": "and"}}},
                    {"match": {
                        "{}".format(key_columns[1]): {"query": elem["{}".format(key_columns[1])], "operator": "and"}}},
                    {"match": {
                        "{}".format(key_columns[2]): {"query": elem["{}".format(key_columns[2])], "operator": "and"}}},
                    {"match": {
                        "{}".format(key_columns[3]): {"query": elem["{}".format(key_columns[3])], "operator": "and"}}}
                ]}}}
            print("INFO : search for element in elasticsearch index")
            res = self._es.search(index=index, body=body)