added parent for all documents (children) in index
move all types into one index for using parent/child
added parent to project document
added route key for all documents in index
added INDEX_NAME constant
added serializer for ParentProject
added indexer service for reindexing all documents
use IndexerService in redmine_elasticsearch:reindex rake task
moved _parent and _routing serialization attributes to new BaseChildSerializer class
added parent to News
added parent to Changeset
added comments to Changeset mapping
added parent to Document
added parent to Issue
added parent to Message
added parent to WikiPage
some refactoring to serializers
added query time
replace big query string by query dsl
added allowed_to_search_query method to all documets