We are upgrading from Lucene 1.4.3 to 1.9.1, and have many customers
with large existing index files. In our testing we have reused large
indexes created in 1.4.3 in 1.9.1 without incident. We have looked
through the changelog and the code and can't see any reason there should
be any problems doing so.
So, we're just wondering, has anyone had any problems, or is there
anything we need to look out for?
Looking at the code and also at the file formats specification:
http://lucene.apache.org/java/docs/fileformats.html
I believe this is completely fine. Meaning, the 1.9.x code can open the
older index format for both searching and writing (either deletes or
added docs), without issue.
Mike
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