CASSANDRA-20752: Add SSTableFlushObserver#onSSTableWriterSwitched #4380
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… SAI segment builder for written shards without waiting for entire transaction to complete (apache#1859) This reduces memory usage during sharded compaction. riptano/cndb#14725 OOM during SAI compaction with large num of shards Flush segment builder when sstable writer is switched to free memory without waiting full compaction to complete
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add SSTableFlushObserver#onSSTableWriterSwitched to flush SAI segment builder for written shards without waiting for entire transaction to complete
This reduces memory usage during sharded compaction.
The PR is cherry-picked from here.
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