Page History
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- http://lucene.apache.org/core/2_9_4/api/core/deprecated-list.html
- https://lucene.apache.org/core/4_0_0/MIGRATE.html,
- https://lucene.apache.org/core/5_0_0/MIGRATE.html.
The use of IndexReader in particular will not change, but filters and queries passed into this may break or otherwise be unusable. Read this article for more information: http://blog.thetaphi.de/2012/02/is-your-indexreader-atomic-major.html
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