The reason is very simple:
Indeed! You make it clear as day :)
The fix: fix "KeywordIndex" such that is removes duplicates from "_unindex[documentId]".
We're looking to see if we can fix it for us ..
Is this fixed in 2.6.x?
If not, please file a collector issue when you have a patch and I'll make sure it's applied on the 2.6 branch as well as the HEAD.
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