Added clonePrefixed method, used by next developments
Added derivedIndexes to BP::Model::Concept and several additional classes, in order to get all the BP::Model::Index instances related to that concept
MongoDB now creates all the declared indexes on the collections where the concept instances are going to be stored
Now prefixed indexes keep it separated from the attribute names, so the different BP::Loader::Mapper implementations can decided what to do
Updated metadata index generation, and index prefix handling
Fixed bug in metadata generation from the data model
Fixed a bug in _TO_JSON, where boolean instances were translated to their representation. But MongoDB have to use the instances, not the translations!
Reworked the derivedIndexes methods around BP::Model::Column and BP::Model::ColumnType, so text indexes are published
Improvements in batch insertions

BP::Loader::Mapper::MongoDB now uses MongoDB::BulkWriter instances, so it does not have to compute in advance the max number of documents it can send.

BP::Loader::Mapper now implements an asynchronous batch insert feature

Also batch-size configuration parameter is now honored in several places of BP::Loader::Mapper::ElasticSearch and BP::Loader::Mapper::MongoDB