mod models code to work with simplified ES document structure

The format was changed from the list-of-field-dicts format of the
JSON files to a simplified regular ol' dict.
use massage_query_results() from ui.models
facet terms list
display object field labels

DDR.models.model_fields now returns field label so updated the
model .get() functions and templates.
updated some facet names
add useful query info (type, model, url) to query hit source
send only the search query hit source to template
search results formatting