title: Search/Delete field with period from ElasticSearch when a nested document with same structure exists
body: <p>I accidentally created a field with periods when I was using the Bulk API to update nested documents. Now, my documents have a nested document and a field name with the same structure. For example, the structure is similar to the following:</p>
  
  <pre><code>{
    "foo":{
      "bar": 123
    },
    "foo.bar": 123
  }
  </code></pre>
  
  <p>This is causing problems when I do queries against my index. How can I go about finding documents with the top-level field "foo.bar" and delete them?</p>