Start implementing cache to models
Prepare for last migration
Add script for correcting language
Merge branch 'logging'
Add more info to export metadata
Correct the author list in export request
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