Cluster Update Settings API complains that `index.plugins.index_state_management.rollover_skip` is an invalid setting. Index Update Settings API seems to work, though. And it's backed up by the definition here: https://github.com/opensearch-project/index-management/blob/6141c3c6fec9fe4c0c7bf733877660e78ed2b1b1/src/main/kotlin/org/opensearch/indexmanagement/indexstatemanagement/settings/ManagedIndexSettings.kt#L78 This PR updates the doc according to the above. Signed-off-by: Radu Gheorghe <[email protected]>