title: reading only specific messages from kafka topic
body: <p>Scenario:</p>
  
  <p>I am writing data JSON object data into kafka topic while reading I want to read an only specific set of messages based on the value present in the message. I am using kafka-python library.</p>
  
  <p>sample messages:</p>
  
  <pre><code>{flow_status: "completed", value: 1, active: yes}
  {flow_status:"failure",value 2, active:yes}
  </code></pre>
  
  <p>Here I want to read only messages having flow_Status as completed.</p>