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LUCENE-8982: Add a note to MIGRATE.md

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Uwe Schindler 2021-01-18 00:50:02 +01:00
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# Apache Lucene Migration Guide
## NativeUnixDirectory removed and replaced by DirectIODirectory (LUCENE-8982)
Java 11 supports to use Direct IO without native wrappers from Java code.
NativeUnixDirectory in the misc module was therefore removed and replaced
by DirectIODirectory. To use it, you need a JVM and operating system that
supports Direct IO.
## Packages in misc module are renamed (LUCENE-9600)
Following package names in misc module are renamed.