Add async index on merge_request_diff_files_99208b8fac
requested to merge 464109-prepare_partitioned_async_index-on-merge_request_diff_files_99208b8fac into master
What does this MR do and why?
We originally added this index in !156091 (merged), however it was discovered that we actually needed to use prepare_partitioned_async_index instead of prepare_async_index, so that original indexing was removed (!167102 (merged))
Related to #464109 (closed)