Start implementing cache to models
Some minor changes of stats & caching
Merged with master
Add caching to category listing
Update config profiles
Implement cache to the rest models
Add missing profile
Add process for getting familiar materials
Update result of the similar materials
Switch from whoosh to ElasticSearch
Add configuration for using Solr
Add material type into search query
Merge branch 'caching'
Now having Elasticsearch in master. Enable search on material type
Fix issue of not showing all material editions
Fix issue of getting person names
Update exporting collection (have more info)