Path was a keyword, so the descendant lookup behind delete/move/restore/purge, the scoped search and the KQL path predicate expanded into one term searcher per descendant and OOM-killed the server on large folders (#1269, #3469).
Path is now analyzed into its ancestor prefixes, like path_hierarchy in OpenSearch: ./a/b.txt becomes ., ./a, ./a/b.txt. A folder's descendants are every document carrying the folder's path as a term, so all three call sites are a single term query. Schema 4 -> 5, v4 never shipped.
The same tokenizer with tag_depth is registered as the geohash analyzer, so #3272 can add its geohash field without another schema change.
Dominik Schmidt
54b62f42e5