title: Exact match in elastic search query
body: <p>I want to exactly match the string <code>":Feed:"</code> in a <code>message</code>  field and go back a day pull all such records. The json I have seems to also match the plain word <code>" feed "</code>. I am not sure where I am going wrong. Do I need to add <code>"constant_score"</code> to this query JSON? The JSON I have currently is as shown below:</p>
  
  <pre><code>{
      "query": {
          "bool": {
              "must": {
                  "query_string": {
                      "fields": ["message"],
                      "query": "\\:Feed\\:"
                  }
              },
              "must": {
                  "range": {
                      "timestamp": {
                          "gte": "now-1d",
                          "lte": "now"
                      }
                  }
              }
          }
      }
  }
  </code></pre>