Refactor change policy API and the policy in managed index to be non-… #2547

Job	Run time
test-and-build (11, ubuntu-latest, ism)	17m 27s
test-and-build (11, ubuntu-latest, non-ism)	15m 19s
test-and-build (11, windows-latest, ism)	5m 43s
test-and-build (11, windows-latest, non-ism)	6m 42s
test-and-build (11, macos-latest, ism)	5m 54s
test-and-build (11, macos-latest, non-ism)	6m 58s
test-and-build (17, ubuntu-latest, ism)	17m 23s
test-and-build (17, ubuntu-latest, non-ism)	13m 56s
test-and-build (17, windows-latest, ism)	6m 40s
test-and-build (17, windows-latest, non-ism)	5m 50s
test-and-build (17, macos-latest, ism)	4m 50s
test-and-build (17, macos-latest, non-ism)	6m 31s
	1h 53m 13s

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