title: How change topic leader or remove partition after some broker down?
body: <p>We have kafka cluster with 4 brokers and some topics with replica factor 1 and 10 partitions. 
  At one moment 2 of 4 our servers with kafka cluster - fail.
  So now we have 2 brokers with same topics. 
  When i<code>m run command 
      ./kafka_topics.sh --zookeeper localhost:2181 --describe 
  i</code>m get this: </p>
  
  <pre><code>Topic:outcoming-notification-error-topic        PartitionCount:10       ReplicationFactor:1     Configs:
      Topic: outcoming-error-topic       Partition: 0    Leader: 2       Replicas: 2     Isr: 2
      Topic: outcoming-error-topic       Partition: 1    Leader: 3       Replicas: 3     Isr: 3
      Topic: outcoming-error-topic       Partition: 2    Leader: 4       Replicas: 4     Isr: 4
      Topic: outcoming-error-topic       Partition: 3    Leader: 1       Replicas: 1     Isr: 1
      Topic: outcoming-error-topic       Partition: 4    Leader: 2       Replicas: 2     Isr: 2
      Topic: outcoming-error-topic       Partition: 5    Leader: 3       Replicas: 3     Isr: 3
      Topic: outcoming-error-topic       Partition: 6    Leader: 4       Replicas: 4     Isr: 4
      Topic: outcoming-error-topic       Partition: 7    Leader: 1       Replicas: 1     Isr: 1
      Topic: outcoming-error-topic       Partition: 8    Leader: 2       Replicas: 2     Isr: 2
      Topic: outcoming-error-topic       Partition: 9    Leader: 3       Replicas: 3     Isr: 3
  </code></pre>
  
  <p>How can i delete Leader 2...4  ? or may be i need delete partition for this Leader , but how ?</p>
  
  <p>UPD..</p>
  
  <p>Also we use kafka_exporter for monitoring kafka with prometheus. After 2 brokers down in log  of kafka_exporter we get this errors:</p>
  
  <pre><code>level=error msg="Cannot get oldest offset of topic outcoming-error-topic partition  10: kafka server: In the middle of a leadership election, there is currently no leader for this partition and hence it is unavailable for writes." source="kafka_exporter.go:296"
  </code></pre>