* [DOCS] Move migrate tool reference
* [DOCS] Fixed link to migration tool
* [DOCS] Small edits to the migrate tool parameters
* [DOCS] Fixed migrate tool example
Original commit: elastic/x-pack-elasticsearch@0ff40ebdcc
* [DOCS] Move security APIs to Elasticsearch Ref
* [DOCS] Update links to security APIs
* [DOCS] Fix link to security APIs
Original commit: elastic/x-pack-elasticsearch@d7a9d3f1ab
This changes the validation criteria we use for user and role
names in the file realm, native realm, and the
realm-agnostic code in x-pack security. The new criteria is:
A valid username's length must be at least 1 and no more than 1024
characters. It may not contain leading or trailing whitespace. All
characters in the name must be be alphanumeric (`a-z`, `A-Z`, `0-9`),
printable punctuation or symbols in the https://en.wikipedia.org/wiki/Basic_Latin_(Unicode_block)[Basic Latin (ASCII) block],
or the space character.
Original commit: elastic/x-pack-elasticsearch@f77640f269