title: How I can solve this problem pymongo.errors.OperationFailure?
body: <p>I'm trying to do a title search in my database, but I can't.</p>
  <pre><code>import pymongo
  
  myclient = pymongo.MongoClient(&quot;mongodb+srv://LOGIN:PASS@cluster0.ye4cx.mongodb.net/info?retryWrites=true&amp;w=majority&amp;ssl=true&amp;ssl_cert_reqs=CERT_NONE&quot;)
  mydb = myclient[&quot;info&quot;]
  mycol = mydb[&quot;comics&quot;]
  
  find = mycol.find({&quot;title&quot;: {&quot;$search&quot;: &quot;68&quot;}})
  
  for f in find:
      print(f)
  </code></pre>
  
  <p>But I get this error</p>
  <pre><code>raise OperationFailure(msg % errmsg, code, response,
  pymongo.errors.OperationFailure: unknown operator: $search, full error: {'operationTime': Timestamp(1601923289, 13), 'ok': 0.0, 'errmsg': 'unknown operator: $search', 'code': 2, 'codeName': 'BadValue', '$clusterTime': {'clusterTime': Timestamp(1601923289, 13), 'signature': {'hash': b'\x82\x91\xc5\xd4r\xd6\xbf\xbc\x13i\xe5\x83b\xd2\x9eUv\xb8\x89/', 'keyId': 6869109962937729027}}}
  </code></pre>