Switch back to a repackaged and fixed version of java-grok (#5800) #5807
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To support underscores ("_") in Grok match group names, we had to modify
the java-grok library to use the old regexp engine again.
See: graylog-labs/java-grok#2
This also adds a test for the Grok extractor to make sure that using
underscores works.
Fixes #5704
Fixes #5563
Fix GrokPatternService#extractPatternNames and add a test for it
Add missing license header to GrokPatternServiceTest
Add test for named group with underscore
Prior to this change, there was no test for named groups
with underscores in the FunctionSnippetsTest
This change enhances the grok() test to run with a
named group with underscore.
(cherry picked from commit e642a41)