* [Monitoring/React] Render ES Nodes Listing with Base Controller
Refactors the ES Nodes Listing to use Base Controller and a React component instead of an Angular directive
* remove another obsolete file
This changes the Advanced Node page for Elasticsearch to recognize the
"write" threadpool, while also incorporating the deprecated "index"
threadpool and renamed "bulk" usage (renamed to "write").
This sums the three writing threadpools together and displays it as a
unified view.