inso

Format INSO means that the update process analyzes the document (INSide Out) to determine what kind of document data is being indexed.

Format INSO意味着更新过程将分析文档(INSide Out)，以确定正被索引的文档数据是那种类型。

If some of these files are rich text (Word, powerpoint, PDF, etc), then I would need to have created the collection with the FORMAT INSO option.

如果其中有些文件是富文本文件(Word、Powerpoint、PDF等)，那么我应该在创建collection时使用FORMAT INSO选项。