In Java 9, a client-side index was added to the HTML generated by Javadoc. This index, which eases the task of navigating large API documentation sets, takes the form of a search box in the upper-right corner of the page. When you type into the box, you get a drop-down menu of matching pages. API elements, such as classes, methods, and fields, are indexed automatically. Occasionally you may wish to index additional terms that are important to your API. The {@index} tag was added for this purpose. Indexing a term that appears in a doc comment is as simple as wrapping it in this tag, as shown in
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