Note that every time a feed is saved to your index, no matter whom it is, that feed will be saved in your index.
请注意，每一次在索引中保存提要时，不论提要是什么，该提要都会被保存到索引中。
2
A view has its index already created when a feed update is requested, so there should not be much impact.
请求提要更新时，视图已经创建其索引，所以影响不大。
3
Lucene can index only plain text documents, so we need a way to extract the plain text from a rich document format like those above and feed it into Lucene.