Javadoc tool not handling nested anonymous classes

[Jason Tedor]

We are seeing this error on JDK 10-ea+35 and JDK 10-ea+36 on all
environments (have not tested earlier builds):

javadoc: error - An internal exception has occurred.
        (com.sun.tools.javac.code.ClassFinder$BadClassFile: bad class file:
/home/jason/src/elastic/elasticsearch/core/build/classes/java/main/org/elasticsearch/rest/action/cat/RestThreadPoolAction$1$1.class
  bad enclosing class for
org.elasticsearch.rest.action.cat.RestThreadPoolAction$1$1:
org.elasticsearch.rest.action.cat.RestThreadPoolAction$1
  Please remove or make sure it appears in the correct subdirectory of the
classpath.)
Please file a bug against the javadoc tool via the Java bug reporting page
(http://bugreport.java.com) after checking the Bug Database (
http://bugs.java.com)
for duplicates. Include error messages and the following diagnostic in your
report. Thank you.
com.sun.tools.javac.code.ClassFinder$BadClassFile: bad class file:
/home/jason/src/elastic/elasticsearch/core/build/classes/java/main/org/elasticsearch/rest/action/cat/RestThreadPoolAction$1$1.class
  bad enclosing class for
org.elasticsearch.rest.action.cat.RestThreadPoolAction$1$1:
org.elasticsearch.rest.action.cat.RestThreadPoolAction$1
  Please remove or make sure it appears in the correct subdirectory of the
classpath.

This looks similar to https://bugs.openjdk.java.net/browse/JDK-8151191 which
is marked as resolved in JDK 9. This issue does not reproduce in JDK 9.

To reproduce this:

$ git clone https://github.com/elastic/elasticsearch.git
<git at github.com:elastic/elasticsearch.git>
$ cd elasticsearch
$ git checkout c831442352c00f6cf840ffc3cbae64694935ce8b
$ JAVA_HOME=/path/to/jdk-10 gradle :core:javadoc

The specific revision is required because I am going to push a change to
disable Javadoc builds on JDK 10 for now so that we can get our JDK 10
builds green. The path should be a path to the root of a JDK 10
installation (e.g., the parent directory to bin).

This requires at least Gradle 4.3. The block of code that it is tripping on
is here:
https://github.com/elastic/elasticsearch/blob/c831442352c00f6cf840ffc3cbae64694935ce8b/core/src/main/java/org/elasticsearch/rest/action/cat/RestThreadPoolAction.java#L78-L98
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