Lucene (Lucence) build index (field)

Lucene, this is the official name, and many people call it Lucence, a toolkit for searching and word segmentation. Others say it is a search engine framework library under Java, which is a matter of opinion. No matter what it is called, it is indeed very useful, such as doing Site-wide search, in fact, its usefulness is far greater than this, and it can be used wherever text search is involved. Let's take site-wide search as an example to demonstrate how to use Lucene to build an index.