Update documentation for writing plugin

Hi,

is that any (up to date) documentation that I can refer for writing ES 5.0 plugin ?

I looking into the source code, but still not quite understand, and that is not much information can find on Internet.

regards
kiwi

I wrote this some months ago. That might help http://david.pilato.fr/blog/2016/10/16/creating-a-plugin-for-elasticsearch-5-dot-0-using-maven-updated-for-ga/

hm.. I need something related to field mapper, builder etc instead.

some how look into the ES source and lack full comments.

but thx anyway !