Manual rollover from hot state to warm state

I have a policy which has Hot, Warm and Cold faces. indices are managed.
I need to manually rollover hot state index to warm state, in case of mappings changes.
I tried rollover but old index and new index both stay in hot state, how can i change state of old index to warm.

Setting “index.lifecycle.indexing_complete” to true works fine in ILM.

Thanks