.param("requests_per_second", requestsPerSecond).param("scroll", scroll).param("max_docs", maxDocs)
                .param("wait_for_completion", Boolean.toString(waitForCompletion)).body(source).execute()) {
            if (response.getHttpStatusCode() == 200) {
                return true;
            }
            logger.warn("Failed to reindex from {} to {}", fromIndex, toIndex);