> On Oct 23, 2024, at 08:46, Prashant Saxena <animator...@gmail.com> wrote: > > I do have a set of old lucene index files, probably 15-20 years old. Every > index directory contains > four files, something like these...(size is different) > > _0.cfx 47, 942 KB > _s.cfs 1,78,687 KB > segments.gen 1 KB > segments_2 1 KB > > When I try to open an index using PyLucene 10.0.0 or java 10.0.0 > > searcher = IndexSearcher(DirectoryReader.open(directory)) > > DirectoryReader throws an error > > org.apache.lucene.index.IndexFormatTooOldException: Format version is not > supported (resource > BufferedChecksumIndexInput(NIOFSIndexInput(path="D:\database\segments_2"))): > -9 (needs to be between 1071082519 and 1071082519). This version of Lucene > only supports indexes created with release 9.0 and later. > > I started opening the index using older versions of Lucene (java based not > PyLucene) one by one and finally the index was opened > using Lucene 2.9.4. The slight difference in the code is > > File oldIndexDir = new File(INDEX_PATH); > Directory directory = FSDirectory.open(oldIndexDir); > IndexSearcher searcher = new IndexSearcher(directory, true); // > read-only=true > > What I need is to upgrade the indexes so that they can be opened using the > latest 10.0.0 version. One logical solution > I can think of is to export the data to sqlite database first and later > create a new index by reading the data back using the latest version. > > I am new to Lucene and recently started diving in. Is there any solution > offered by API for this problem?
This is a question for the Lucene user group: java-u...@lucene.apache.org. > I would prefer a solution based on PyLucene but if it's not possible then a > java based solution would also be fine. The java solution get from the user list should translate easily into a PyLucene solution one-to-one. Andi.. > > Prashant
