Specify whether to generate an index.

Default Value:

> The default value of this parameter is set according to the `-noindex` option found on the Javadoc command line. If this option is specified, the default value is `false`, otherwise it is `true`.

> ${include ../refs/standard_doclet_options.htm}

Related Templates:

> The index is generated by two templates:
> `JavadocPro/lib/index-all.tpl`
>   generates a single `'index-all.html'` file
> `JavadocPro/lib/index-letter.tpl`
>   generats either separate index files for each particular letter or corresponding sections of the single index file.