dsmiley commented on issue #824: LUCENE-8755: QuadPrefixTree robustness URL: https://github.com/apache/lucene-solr/pull/824#issuecomment-519654862 > Does the indexed data contain luncene version info which created the index? If it contains, We can use old code to search in old indexed data. It does contain the version of Lucene, but not the Version used in analysis components (see class Version.java). In a sense the SpatialStrategy impls play the role of an analysis component & more). In order for a user of Lucene (e.g. Solr and it's users) to be able to use an existing index when they upgrade Lucene, a user can configure a specific version for analysis components consistent with the version that was used to write the index (will get set on an Analyzer.setVersion(...). If this is Solr, then this is set via luceneMatchVersion; raw Lucene usage requires explicit control here. There has yet to be a SpatialStrategy that tweaked it's operation based on the Version; the only change or two that comes to mind were backwards compatible (e.g. fewer needless terms). So there's no trace of Version usage in spatial-extras as of yet. I know this is kinda a pain to concern yourself with.
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