Fix ep_index_meta getting too large from indexing errors

Description

Please make sure the items below have been covered before requesting a review:

[x] This change works and has been tested locally (or has an appropriate fallback).
[ ] This change works and has been tested on a Go sandbox.
[ ] This change has relevant unit tests (if applicable).
[ ] This change has relevant documentation additions / updates (if applicable).
[x] This change has the fix PRed upstream (if applicable). If not applicable, it has the relevant "// VIP: reason for the discrepancy with upstream" comment in places where the code is discrepant.