Add a TermStatsFacet() class to the facets module to support the ES 'terms_stats' facet type.
Add a TermStatsFacet() class to the facets module to support the ES 'terms_stats' facet type.

Fiedzia/pyes,mavarick/pyes,Fiedzia/pyes,HackLinux/pyes,HackLinux/pyes,aparo/pyes,haiwen/pyes,jayzeng/pyes,mavarick/pyes,jayzeng/pyes,rookdev/pyes,jayzeng/pyes,haiwen/pyes,mavarick/pyes,haiwen/pyes,Fiedzia/pyes,rookdev/pyes,mouadino/pyes,HackLinux/pyes,aparo/pyes,mouadino/pyes,aparo/pyes