Lee Hinman 218e9a57bb Correct documentation for number of salt generation rounds (elastic/x-pack-elasticsearch#4322)
For the user cache, the crypt option rounds are actually the log2 of the number
of rounds. This commits updates the documentation to reflect this.

Original commit: elastic/x-pack-elasticsearch@d3cc2b7f29
2018-04-09 10:59:06 -06:00
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