Elasticsearch user authentication using java client with open source plugin

[Lavakush]

I want to implement elasticsearch user authentication using java client . is there any open source plugin available to achieve so? I do not wish to use shield.

[Ravi_Shanker_Reddy]

Some body says its working. Try this once

Shield Alternative

I protected Kibana and elasticsearch with shield. The problem is it's only 30-day trial. Is there another way to protect Kibana and elasticsearch and how to do it?