Does master node update cluster state document for upserts?

So, I understand the master nodes updates cluster state documents when I create or delete an index. What if I just have one index ( I am not going to create or delete any other indices). and I constantly add data to this index. What role does the master node have in this case? Does it have to update cluster state document for upserts?

The master does not participate in normal index or search requests at all. The only exception is if mappings are changed or added, as that goes into the cluster state.

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