Apache Airflow version 2.1.1rc1 Bug Fixes """"""""" - Don't crash attempting to mask secrets in dict with non-string keys (#16601) - Always install sphinx_airflow_theme from ``PyPI`` (#16594) - Remove limitation for elasticsearch library (#16553) - Adding extra requirements for build and runtime of the PROD image. (#16170) - Cattrs 1.7.0 released by the end of May 2021 break lineage usage (#16173) - Removes unnecessary packages from setup_requires (#16139) - Pins docutils to <0.17 until breaking behaviour is fixed (#16133) - Improvements for Docker Image docs (#14843) - Ensure that ``dag_run.conf`` is a dict (#15057) - Fix CLI connections import and migrate logic from secrets to Connection model (#15425) - Fix Dag Details start date bug (#16206) - Fix DAG run state not updated while DAG is paused (#16343) - Allow null value for operator field in task_instance schema(REST API) (#16516) - Avoid recursion going too deep when redacting logs (#16491) - Backfill: Don't create a DagRun if no tasks match task regex (#16461) - Tree View UI for larger DAGs & more consistent spacing in Tree View (#16522) - Correctly handle None returns from Query.scalar() (#16345) - Adding ``only_active`` parameter to /dags endpoint (#14306) - Don't show stale Serialized DAGs if they are deleted in DB (#16368) - Make REST API List DAGs endpoint consistent with UI/CLI behaviour (#16318) - Support remote logging in elasticsearch with ``filebeat 7`` (#14625) - Queue tasks with higher priority and earlier execution_date first. (#15210) - Make task ID on legend have enough width and width of line chart to be 100%. (#15915) - Fix normalize-url vulnerability (#16375) - Validate retries value on init for better errors (#16415) - add num_runs query param for tree refresh (#16437) - Fix templated default/example values in config ref docs (#16442) - Add ``passphrase`` and ``private_key`` to default sensitive field names (#16392) - Fix tasks in an infinite slots pool were never scheduled (#15247) - Fix Orphaned tasks stuck in CeleryExecutor as running (#16550) - Don't fail to log if we can't redact something (#16118) - Set max tree width to 1200 pixels (#16067) - Fill the "job_id" field for ``airflow task run`` without ``--local``/``--raw`` for KubeExecutor (#16108) - Fixes problem where conf variable was used before initialization (#16088) - Fix apply defaults for task decorator (#16085) - Parse recently modified files even if just parsed (#16075) - Ensure that we don't try to mask empty string in logs (#16057) - Don't die when masking ``log.exception`` when there is no exception (#16047) - Restores apply_defaults import in base_sensor_operator (#16040) - Fix auto-refresh in tree view When webserver ui is not in ``/`` (#16018) - Fix dag.clear() to set multiple dags to running when necessary (#15382) - Fix Celery executor getting stuck randomly because of reset_signals in multiprocessing (#15989)