Misc Mapping/Indexing enhancements

* [ ] Revisit analyzer, see if anything makes sense to add or remove
* [ ] Store array of all ancestors
* [ ] Convert `permalink` to an object, store it analyzed, raw, extract the URI, and store an array of components
* [ ] Add array of shortcodes in posts
* [ ] Convert `post_mime_type` to object, store raw, type, and subtype. For instance, `post_mime_type.type` would be `image`, `audio`, `video`, etc. and `post_mime_type.subtype` would be `png`, `mpeg`, `mp4`, etc.
* [ ] Consider converting some objects to `nested`
* [ ] Add post thumbnail url