Nested boolean queries for ElasticSearch

boolquery.json

{
   "bool":{
      "must":[
         {
            "query_string":{
               "default_field":"content",
               "query":"test1"
            }
         },
         {
            "query_string":{
               "default_field":"content",
               "query":"test4"
            }
         }
      ],
      "must_not":{
         "query_string":{
            "default_field":"content",
            "query":"test2"
         }
      },
      "should":{
         "query_string":{
            "default_field":"content",
            "query":"test3"
         }
      }
   }
}

This is not nested is it? It's the outer level for what is contained inside a bool query