Create a PreBuiltXPackTransportClient object need username and password,so every logined person will has their own PreBuiltXPackTransportClient object，
In order to make PreBuiltXPackTransportClient object reusable，I store them in a map，but if millions of people login in my system for searching，the map will take up more memory，and I don't known which PreBuiltXPackTransportClient object I should remove and clean .
What should I do for this problem？
You should move to the REST client. It has a Request Option that is probably useful for that.
Thanks dadoonet, I will try it
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