What is blocks in _cluster/state response?

Can someone please explain what the 'blocks' section of the response in cluster status?

# Return only blocks data
$ curl -XGET 'http://localhost:9200/_cluster/state/blocks'

The doc does not say what it is.

This describes which operations are blocked and why. For instance, an index needs to be recovered in order to be written to, a cluster needs to have a master in order to have its metadata updated, etc.

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