The associated ILM policy determines how frequently (by age and/or size) a new backing index is generated. The date in the index name does not mean it is generated every day, just that the date it was created is added to the index name. You can as far as I know skip days between generations, e.g. go from .ds-test-2222.06.12-000012 to .ds-test-2222.06.26-000013 if the indices are rolled 14 days apart.
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