Cherry-pick #20170 to 7.9: [Filebeat] Fix fileset field namespacing#20198

Merged

andrewkroh merged 1 commit intoelastic:7.9from andrewkroh:backport_20170_7.9

Jul 23, 2020

+4,214-4,236

Commits on Jul 23, 2020

Fix fileset field prefixing (elastic#20170 )
andrewkroh
committed