uschindler commented on issue #12501:
URL: https://github.com/apache/lucene/issues/12501#issuecomment-1674955262
> So it looked like this SPI extension point loss was an unwitting
side-effect of a sequence of refactorings.
No, the SPI fromName does not allow you to change the implementation, as
there can only be one "Lucene50" implementation on classpath. If you want to
have another codec it must have a new name and therefore for (new) indexes
passed via IndexWriterConfig using a new codec.
> private final PostingsFormat defaultFormat =
PostingsFormat.forName("Lucene50");
This does not allow you to overwrite the format, you still need to subclass
codec, as the name "Lucene50" is part of Lucene core and can't be replaced. So
it will always load the hardcoded 5.0 codec.
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