title: SOLR search not including data within JSON Field
body: <p>I have a bunch of documents included in my SOLR index. These documents contain a field that contains JSON data.</p>
  
  <p>When I perform a query with a keyword I want that JSON field to be also searched. Right now it is not working.</p>
  
  <p><strong>QUERY:</strong></p>
  
  <pre><code>{
    "responseHeader":{
      "status":0,
      "QTime":0,
      "params":{
        "q":"keyword_to_search",
        "defType":"edismax",
        "qf":"title^300",
        "fl":"field_name:[json]",
        "wt":"json",
        "_":"1551735180672"
      }
    },
    "response":{
      "numFound":0,
      "start":0,
      "docs":[]
    }
  }
  </code></pre>
  
  <p>There is actual documents that contains a JSON field with the data 'keyword_to_search'.</p>
  
  <pre><code>"field_name":"{\"field_key\": \"keyword_to_search\"}",
  </code></pre>
  
  <p>The field seems to be searchable as I can return the document when querying:</p>
  
  <pre><code>{
    "responseHeader":{
      "status":0,
      "QTime":0,
      "params":{
        "q":"{!term f=field_name}keyword_to_search",
        "_":"1551735532524"
      }
    },
    "response":{"numFound":1,"start":0,"docs":[
      {
      ...
      "field_name":"{\"field_key\": \"keyword_to_search\"}",
      }
    ]}
  }
  </code></pre>
  
  <p>How can modify my query to include this?</p>
  
  <p><strong>JSON Structure:</strong></p>
  
  <pre><code>{
    ...
    "field_name": "field_value",
    "columns": [
      ...
      {
          "nested_key": "nested_value_1"
      },
      {
          "nested_key": "nested_value_1"
      },
    ],
  }
  </code></pre>