Cherry-pick #21391 to 7.x: [libbeat] Enable WriteAheadLimit in the disk queue#21401
Cherry-pick #21391 to 7.x: [libbeat] Enable WriteAheadLimit in the disk queue#21401faec merged 1 commit intoelastic:7.xfrom
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(cherry picked from commit ef6274d)
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Cherry-pick of PR #21391 to 7.x branch. Original message:
This PR activates the previously inert setting
WriteAheadLimit, which limits how many events the disk queue will store in memory waiting to be written to disk (this is to prevent unbounded memory use / provide back-pressure when the beat is under extremely high load and is receiving inputs faster than they can be written to disk).