cleanup elasticsearch-embedded.yml : keep only active settings.
Improved logs.
Use query builder instead of query.
Elasticsearch mapping rewritten to be compatible with Lucene version.
Index creation uses json mapping configuration.
Indexation and deletion methods rewritten for compatibility with Lucene version.
Correction of invalid value in mapping file.
Added tatami.elasticsearch.http.enabled flag to disable the elasticsearch REST access in embedded mode. The access is activated in developper mode.
During initialization phase, ElasticsearchService checks the existence of tatami's index and creates it if necessary.