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Hi!
Currently plugin has limitation in max 100 users, and if your have more than 100 user, plugin works incorrect.
We have 100+ users in our ES cluster and some users can't login. It was a suddenly for us.
I think need to add information about this limit to readme.
Issue in this line: https://github.com/elasticfence/elasticsearch-http-user-auth/blob/2.4.1/src/main/java/org/elasticsearch/plugin/elasticfence/data/UserDataBridge.java#L322