A memory saving optimization would be to not load the corresponding String[] in the string index (as discussed previously), but there is currently no way to tell the FieldCachethat the strings are unneeded. The String values are only needed for merging results in a MultiSearcher.
Yep, which happens all the time for us specifically, because we have an 'archive' and 'week' index. the week index is merged once per week, so the search is always a merged sort across the 2. (the week index is reloaded every 5 seconds or so, the archive index is kept in memory once loaded).
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