@Override
	public int hashCode() {
		return Objects.hash(
			isAppendOnly,
			schema,
			hosts,
			index,
			docType,
			keyDelimiter,
			keyNullLiteral,
			serializationSchema,
			contentType,
			failureHandler,
			sinkOptions);
	}
Key field indices determined by the query.
elasticsearch5-xh/elasticsearch5-xh-sink/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchUpsertTableSinkBase.java