... 索引直接存取法 indexed direct access method 索引栏 indexed field 索引档案，索引式数据文件 indexed file ...
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Sparse indexes only contain entries for documents that have the indexed field.
稀疏索引只包含文档的索引字段的条目。
The content in a field can be indexed or just stored as is for use by an application.
可以为字段中的内容建立索引，或者原样储存供应用程序使用。
A field is made up of the actual content to be indexed or stored plus metadata telling Lucene how to handle that content and a boost value indicating that field's importance.
字段由需要索引和储存的实际内容、告诉Lucene如何处理该内容的元数据和表明该字段的重要性的增强值组成。
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