Hi all, I have some indices indexed with lucene 5.5.0. I have updated my dependencies and code to Lucene 7 (but my final goal is to use Lucene 9) and when trying to work with them I am having the exception: org.apache.lucene.index.IndexFormatTooOldException: Format version is not supported (resource BufferedChecksumIndexInput(MMapIndexInput(path=".......\tests\segments_b"))): this index is too old (version: 5.5.0). This version of Lucene only supports indexes created with release 6.0 and later.
I want to migrate from Lucene 5.x to Lucene 9.x. Which is the best strategy? Is there any tool to migrate the indices? Is it mandatory to reindex? In this case, how can I deal with this when I do not have the sources of documents that generated my current indices (I mean, I just have the indices themselves)? Thanks, -- Pablo Vázquez (pabl...@gmail.com)
