Manage errors on client instantiation

Manage exceptions when errors occur during client instantiation and log them.

Fixing semantic versioning

Semantic versioning was used wrong, this version is the first step towrds fixing that.

Also includes a patch creating the tmp index mapping from existing main during hotswap

Hotswap

Added a feature allowing hotswap of an index to its temporary counterpart, to allow clean reindex

set sort

Added a setSort function

Better _source field management

Merge pull request #50 from CheapHasz/better-source-management

Better source management

Fix boolean TermFilter

Since ElasticSearch 6, boolean TermFilter must be false / "false" / true / "true". see https://www.elastic.co/guide/en/elasticsearch/reference/6.4/boolean.html

Casting a boolean to string didn't achieve that, and was failing

Script functions

• Added support for ScriptField https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-script-fields.html
• Added support for ScriptScore https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html#function-script-score

ES6 compatibility

Merge pull request #47 from CheapHasz/es6-compat

Es6 compat