Avoid updating settings version in MetadataMigrateToDataStreamService when settings have not changed #118704
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If the input index already has the
index.hidden
setting set totrue
, MetadataMigrateToDataStreamService::prepareBackingIndex can incorrectly increment the settings version even if it does not change the settings. This results in an assertion failure in IndexService::updateMetadata that will take down a node if assertions are enabled. This fixes that, only incrementing the settings version if the settings actually changed.