This file is indexed.

/usr/share/doc/gnat-gps/help_index.html is in gnat-gps-doc 5.3dfsg-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!-- This is a template for GPS's documentation index 
     The line containing @@CONTENTS@@ is replaced by the actual contents
-->
<html>
<head>
<title>Documentation contents</title>
</head>
<body>
<H1>Documentation contents</H1>
This page gives the list of all the documentation topics currently
registered in GPS.

@@CONTENTS@@

</body>
</html>