Binary package “htdig-doc” in ubuntu xenial

web search and indexing system - documentation

 The ht://Dig system is a complete web search engine for a small
 domain or intranet. It is not meant to replace the major
 Internet-wide search engines; instead it is meant to cover the search
 needs of a single company, campus, or even a particular subsection of
 a website.
 .
 This package provides the HTML documentation and examples.