Following https://jira.ez.no/browse/EZP-23465, Solr search field map implementation needs the same treatment.
Move field map to storage
Elasticsearch: refactor FieldMap implementation for caching and multiple fields support
Implement search SPI on Elasticsearch
Pull request: https://github.com/ezsystems/ezpublish-kernel/pull/1154
Merged to ezpublish-kernel/master: https://github.com/ezsystems/ezpublish-kernel/commit/0d1fc5569d901a1cc6ad826b8c9f3cfcbf939527
No Q.A. needed, after the talk in the morning meeting