Are there any differences between metadata and index in terms of search? m My understanding is that metadata for a document can be something such as author, keyword, etc. Index operation can be performed against the content body itself, against the metadata itself, against the metadata body+ metadata. Is this understanding right? What kind of support that lucene provide for metadata extraction and indexing?Are there any differences between metadata and
阅读背景：
搜索中索引和元数之间的差异以及lucene的支持
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