These temp-hmc files can be removed manually. Normally the lucene cronjob should remove them but I believe it’s not doing it by default. There is a low chance to encounter any issue after they are deleted, it’s an old hmc index, it’s just going to be a bit slower.
Significantly, to avoid having huge indexes, make sure the variable update.index.configuration is set to true during a system update of lucenesearch. This will make sure old indexes are deleted before being rebuilt. For more info on the process, check here.
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