Nik Everett 9822a6f911 Docs: Explain closing the high level client
It looks like we weren't clear on when and why you should close the high
level client and folks were closing it after every request which is not
efficient. This explains why you should close the client and when so
this shouldn't be as common.

Closes #32001
2018-07-12 16:22:42 -04:00
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