This file is indexed.

/usr/share/tomcat8-docs/docs/websocketapi/index.html is in tomcat8-docs 8.5.30-1ubuntu1.

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

The actual contents of the file can be viewed below.

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<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
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  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
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<!DOCTYPE html>
<html>
    <head>
    <meta charset="UTF-8" />
    <title>API docs</title>
</head>

<body>

The WebSocket Javadoc is not installed by default. Download and install
the "fulldocs" package to get it.

You can also access the javadoc online in the Tomcat
<a href="http://tomcat.apache.org/tomcat-8.5-doc/">
documentation bundle</a>.

</body>
</html>