[7.x] Improve data stream rollover and simplify cluster metadata validation for data streams #70987
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danhermann
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Mar 29, 2021
… for data streams (elastic#70987)
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If a naming conflict for a new write index is detected when a data stream rolls over, it will now increment its own generation until the new write index's name does not conflict with any other indices, aliases, or data streams. This allows us to remove the trappy validation around name conflicts for the backing indices of data streams.
Fixes #70905.
Backport of #70934