IBM® Content Search Services performs the text extraction step for any documents that are submitted to it by IBM Content Collector. A temporary directory stores the intermediate files that are created as a byproduct of indexing documents. In particular, the temporary directory is heavily used for text extraction. The intermediate files in the temporary directory might grow over time if you use IBM Content Collector.
You can improve performance by specifying a RAM disk or other fast storage (such as SSD or striped disk storage) for the temporary directory. The following parameter determines the location of this temporary directory: tempDirPath.