Merge branch 'entity_research' into 'master'

arkindex/documents/api/search.py

arkindex/documents/management/commands/reindex.py

arkindex/documents/models.py

arkindex/documents/search.py

arkindex/documents/serializers/search.py

arkindex/documents/tests/commands/test_reindex.py

arkindex/documents/tests/test_search.py

arkindex/project/api_v1.py

arkindex/project/mixins.py

arkindex/project/settings.py

arkindex/templates/elastic/search_entities.json