Upgrade mappings to comply with ES6 and default_field search

Upgrade mappings to comply with ES6:

Type "string" is dropped in favour of "text", it will be analyzed with the default analyzer.
Analyzer "not_analyzed" is dropped and is the default of type "keyword".

Refactor mappings to comply with search pattern:

Add _search_all field with english and french analyzers.
Add copy_to to _search_all in every field/subfield that should be searchable in global searches (per field searches are not affected).

Change secrets in OpenShift to point to cernsearch6

Edited Feb 04, 2019 by Pablo Panero