Searchable snapshot action - in cold phase restores the index to random data tier instead of only cold data tier

[DavidTurner]

@Kannappan_Somu

          "routing" : {
            "allocation" : {
              "require" : {
                "data" : "hot"
              }
            }
          }

This suggests you're not using data tiers, you're just setting node attributes. You should define your hot tier with node.roles: data_hot, similarly for warm and cold, then the _tier_preference filter will do the right thing.