How can I convert specific web page to markdown or asciidoc with pandoc?

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Java

documentation

I want to convert java specification documentation to easily editable formats(markdown or asciidoc) and upload GitHub Gist and customize(adding my code experiences and notes.) I want to convert to something like this

I use a tool called pandoc that allows us to convert from HTML to markdown.

What I have tried:

Technique 1
I tried to convert all table of components of java specification on index.html

pandoc -f html -t markdown -o test2.md    https://docs.oracle.com/javase/specs/jls/se10/html/index.html

I got this:test2.md (I did not upload here because the file of contents is too long)

Problem: This markdown file does not have contents of java specification documentation. I expected that I got markdown toc(table of components) and java specification documentation contents in markdown file like this`


Technique 2(better than tech 1)
2-)I downloaded all HTML files of TOC with HTTrack and try to convert all files separately.

pandoc -f html-native_divs-native_spans -i jls-1.html -t markdown -o test2.md  

I got following markdown file which does not redirect table of components:test3.md


How can I fix this and convert java specifiation properly?