Add CustomDomain and Operator as default indexed keys

[mantas-sidlauskas]

What changed?
Adding CustomDomain and Operator to default indexed keys

Why?
This will support batch workflow operations without manually adding those attributes later

How did you test it?
Running locally with ES/Kafka

Potential risks

Release notes

Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build ba9f2ecf-8d2e-43b1-8145-2b167cb054f1

• 24 of 33 (72.73%) changed or added relevant lines in 7 files are covered.
• 117 unchanged lines in 17 files lost coverage.
• Overall coverage decreased (-0.04%) to 56.917%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
common/persistence/persistence-tests/dbVisibilityPersistenceTest.go	0	1	0.0%
tools/cli/util.go	0	1	0.0%
common/persistence/sql/sqlVisibilityStore.go	1	4	25.0%
common/persistence/nosql/nosqlVisibilityStore.go	1	5	20.0%

Files with Coverage Reduction	New Missed Lines	%
common/persistence/nosql/nosqlVisibilityStore.go	1	50.42%
common/types/shared.go	1	26.66%
service/history/queue/timer_queue_processor_base.go	1	77.92%
client/history/client.go	2	38.58%
client/history/metricClient.go	2	45.3%
common/persistence/historyManager.go	2	66.67%
common/task/weightedRoundRobinTaskScheduler.go	2	89.64%
service/history/handler.go	2	47.6%
service/history/task/transfer_active_task_executor.go	2	71.93%
service/matching/taskListManager.go	2	73.77%

Totals
Change from base Build c52c8cc8-c5f9-443a-b73e-dcbd31eb5d69:	-0.04%
Covered Lines:	83931
Relevant Lines:	147461

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💛 - Coveralls