sabi0 opened a new issue, #12501:
URL: https://github.com/apache/lucene/issues/12501
### Description
`Lucene70Codec` had:
```
private final PostingsFormat defaultFormat =
PostingsFormat.forName("Lucene50");
```
In the `Lucene80Codec` PostingsFormat instantiation was moved to the
constructor. Presumably to pass the additional `fstLoadMode` parameter?
https://github.com/apache/lucene/commit/28e8a30b536a39e5539ac6e8b9407d31724c8857#diff-3a74c1b72ab52e54dfcdc9de142b4331b372c11bcca87842b001c30f89ce58ebR98
In a subsequent commit the code was reverted to the default PostingsFormat
constructor:
https://github.com/apache/lucene/commit/651f41e21bd3df98f70d2673295db29506e3d2e6#diff-3a74c1b72ab52e54dfcdc9de142b4331b372c11bcca87842b001c30f89ce58ebR96
But the SPI call `PostingsFormat.forName()` was not restored. And is still
missing in `Lucene95Codec`:
https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/codecs/lucene95/Lucene95Codec.java#L121
Restore the SPI extension point to allow overriding the PostingsFormat
without having to override the Codec?
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