Elasicsearch index error: org.elasticsearch.core.Tuple.v2()" is null

Hi there,

We have recently moved from a single node to multi node cluster and I have set up an ILM to move from hot, warm to cold.

I keep seeing data moving from cold to warm despite it being marked as complete. I'm confused why cold data is being moved to warm. When I go to the index, I see this error:

`Index lifecycle error

null_pointer_exception: Cannot invoke "org.elasticsearch.xpack.core.ilm.Step.getKey()" because the return value of "org.elasticsearch.core.Tuple.v2()" is null`

Unfortunately I can't find anything online about this. Does anyone have any advise?

Thank you.

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