dungba88 opened a new pull request, #12980:
URL: https://github.com/apache/lucene/pull/12980

   ### Description
   
   Note: This PR is not ready yet. There are still some failed tests I'm trying 
to figure out.
   
   This is an attempt to make FSTPostingFormat to write the FST off-heap. 
Instead of write it on-heap then save to disk, we configure the compiler to 
write the FST off-heap right from the start.
   
   Some additional changes:
   - As we can't write the FST metadata and FST data on the same file, now we 
need to break the `tfp` file into 2 files: `tfp.meta` and `tfp.data`
   - We need to write the starting address of the FST data in the posting 
metadata file, then seek to that address when read


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