nosql - Arangodb AQL UPDATE for internal field of object -

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Looking at the following example documentation: 

  {"timestamp": 1413543986, Message ":" message "," read ": {" 8 ": zero," 9 ": zero," 22 ": faucet}," type ":" 1014574149174 "}

How can I update the value of a specific key in an object with the key "read" key? For example, update value for key "8": 

  ... "8": 10, ...   
 
 
 You can use either MERGE or MERGE_RECURSIVE as C: Update  
  db._query ("FOR FILTER IN U._key == @ key" UPDATE "with UPDATE: MERGE_RECURSIVE (u.read, {'8': 10})} IN test ", {key:" 11611344050 "}  
 
 merge the merge documents, where the latter value will overwrite the first look for details.

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