Why Elasticsearch new version appending -000001 for index name

We are getting index name appended with -000001 for index name.
Just wanted to understand why Elasticsearch appending this value for index name in elastcsearch cluster 7.10? What is the significance of it?

That would ILM creating and managing indices.

What is the use of this if no any policy is defined?

Which indices are these happening to?

indices created in Elasticsearch version 7.10

Yes, but are they Beats, system indices, other custom ones?

custom one

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