Nik Everett 7ffea4621d
Extract capture config from grok patterns up front (backport of #62706) (#62785)
This extracts the configuration for extracting values from a groked
string when building the grok expression to do two things:
1. Create a method exposing that configuration on `Grok` itself which
   will be used grok `grok` flavored runtime fields.
2. Marginally speed up extracting grok values by skipping a little
   string manipulation.
2020-09-22 17:44:42 -04:00
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