a) remove mergeIndex property and event listener, add mergeIndex as a part
of loading/compaction transaction.
b) if the merging index failed, loading/compaction should fail directly.
c) keep merge_index command and mark it deprecated.
for a new table, maybe it will do nothing.
for an old table, maybe we need to tolerate the probable query issue
(not found index files).
It could be a deprecated feature in the future.
b). At the end of loading, retrying to finish index merging or
tablestatus update is a good suggestion.
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Best Regards
David Cai
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