Updates after the initial update are incremental, unchanged objects that have already been indexed will not be indexed again.
初始更新之后是增量更新，那些已经被索引且没有被修改的对象不会被再次索引。
Updates after the initial update are incremental, unchanged objects that have already been indexed will not be indexed again.
初始更新之后是增量更新，那些已经被索引且没有被修改的对象不会被再次索引。
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