Nix ES_INDEXING_TIMEOUT and es_indexing_es()

The default timeout for making a connection is 5s. The indexing timeout
was 30s. That's something I implemented a year ago in Kitsune when I
didn't quite understand what was going on.

We really don't need it and so it's better to just nix it for reduced
complexity.
Cosmetic change

Changes "Search" to "ElasticSearch".