7.2.0

• Updates specs and dependency to use with elasticsearch v7.14.0.
• Update README, remove Virtus (unmaintained)
• Updates Bundler.with_clean_dev (deprecated) to with_unbundled_env commit
• Deal with nil document types in Multimodel commit
• Update dependency to explicitly support version 7 commit
• Stop emitting FATAL log when checking existence of indices commit
• Remove unnecessary exception test on index checking commit
• Removes dependency on extensions commit
• Fixes basic template elasticsearch dependency commit

ActiveModel

• Fixes indexing to use right logger in client
• Updates ES client spec for client 7.14.0
• Updates transport references