anchor.diff:  [source,js]
   --------------------------------------------------
   curl -XPUT localhost:9200/test/_settings -d '{
  -      "index.routing.allocation.include.tag" : "value1,value2" 
  -}' 
  +      "index.routing.allocation.include.tag" : "value1,value2"
  +}'
   --------------------------------------------------
   
   On the other hand, we can create an index that will be deployed on all
  
positive.code: curl -XPUT localhost:9200/_cluster/settings -d '{
      "transient" : {
          "cluster.routing.allocation.exclude._ip" : "10.0.0.1"
      } 
  }' 
  --------------------------------------------------
  
negative.code:     "index.routing.allocation.include.group2" : "yyy",
      "index.routing.allocation.exclude.group3" : "zzz",
      "index.routing.allocation.require.group4" : "aaa"
  }'
  --------------------------------------------------
  
  The provided settings can also be updated in real time using the update
  