return null;
            }
            final String requestsPerSecond = String.valueOf(fessConfig.getIndexReindexSizeAsInteger() * fessConfig.availableProcessors());
            logger.info("Set requests_per_second: value={}", requestsPerSecond);
            return requestsPerSecond;
        }
        return value;
    }

    /**
     * Creates a new index with default settings.

index.reindex.body={"source":{"index":"__SOURCE_INDEX__","size":__SIZE__},"dest":{"index":"__DEST_INDEX__"},"script":{"source":"__SCRIPT_SOURCE__"}}
# Requests per second for reindex operations ("adaptive" for auto).
index.reindex.requests_per_second=adaptive
# Whether to refresh the index after reindexing.
index.reindex.refresh=false
# Timeout for reindex operations.
index.reindex.timeout=1m
# Scroll timeout for reindex operations.
index.reindex.scroll=5m

    String INDEX_REINDEX_BODY = "index.reindex.body";

    /** The key of the configuration. e.g. adaptive */
    String INDEX_REINDEX_requests_per_second = "index.reindex.requests_per_second";

    /** The key of the configuration. e.g. false */
    String INDEX_REINDEX_REFRESH = "index.reindex.refresh";

    /** The key of the configuration. e.g. 1m */