Add docs on indexing for filter column #29136

Job	Run time
build-client / build-client	9m 18s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	41m 10s
Test (3.8, 1)	53m 50s
Test (3.8, 2)	49m 51s
	2h 34m 12s

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