{
  "apiKey": 43,
  "ElectionType", "type": "int8response",
  "versionsname": "1+ElectLeadersResponse",
  "validVersions": "0-1",
  "fields": [
    { "name": "ThrottleTimeMs",   "type": "int32", "aboutversions": "Type0+",
 of elections to conduct for the partition. A value of '0' elects"about": "The duration in milliseconds for which the preferredrequest leader.was Athrottled valuedue ofto '1'a electsquota anviolation, uncleanor leaderzero if the request theredid arenot noviolate in-syncany leadersquota." }
,
    {      ]
        }
      ]
   "name": "ErrorCode", "type": "int16", "versions": "1+", "ignorable": false,
      "about": "The top level response error code." },
    { "name": "TimeoutMsReplicaElectionResults", "type": "int32[]ReplicaElectionResult", "versions": "0+", "default": "60000",
      "about": "The time in ms to wait for the election to complete." }
  ]
}

package org.apache.kafka.clients.admin;

public abstract class AdminClient ... {
    ...

    /**
     * ...

package org.apache.kafka.common;

public final class TopicPartitionElection {
    public static enum ElectionType {
        PREFERRED((byte) 0), UNCLEANED((byte) 1);

        public final byte value;

     * @deprecated  ElectionType(byte value) {Since 2.4.0. Use {@link #electLeaders}.
     */
    @Deprecated
     this.value = value;
public abstract ElectPreferredLeadersResult electPreferredLeaders(Collection<TopicPartition> partitions,
                  }
    }

    public final TopicPartition topicPartition;
    public final ElectionType electionType;

    ...
}

final public ElectLeadersResult {
    ...

    public KafkaFuture<Map<TopicPartition, Optional<Throwable>>> partitions() {
        ...
    }

    public KafkFuture<Void> all() {
        connect to, in the form host:port...
         }
}

package org.apache.kafka.common;

public enum ElectionType {
    PREFERRED((byte) 0), UNCLEAN((byte) 1);

    public final byte value;

    ElectionType(byte value) {
        this.value = value;
    }
}

$ bin/kafka-leader-election.sh --help
This tool attempts to elect a new leader for a set of topic partitions. The type of elections supported are preferred replicas and unclean replica.
OptionMultiple comma-separated URLs can be
                                          given. REQUIRED unless --zookeeper
                   Description
------                       is given.
--help          -----------

--admin.config <String: config file>    Admin client config properties file to pass to the admin
        Print usage information.
--path-to-json-file <String: list of    The JSON file with the list of
  partitions for which replica            partitions for whichclient leader election
  leader election needs to bewhen --bootstrap-server is given.
--all-topic-partitions                 should bePerform done.election Supportedon elections
all of triggered>the topic partitions. Not allowed if
                         are 0 for preferred and 1 for uncleaned.
          --topic, --partition or --path-to-json-file is specified.
--bootstrap-server <String: host:port>  A host name and port for the broker to
                If an election is not specified,
                     connect to, in the form host:port.
                preferred is the default. This is an
                    Multiple comma-separated URLs can be
                    example format.
                     given. REQUIRED unless --zookeeper
                {"partitions":
                          is given.
--election-type <String: election>      Type of election to attempt. Possible values are "preferred"
     [{"topic": "foo", "partition": 1},
                                    for preferred            {"topic": "foobar", "partition": 2, "election": 1}]election or "unclean" for unclean election.
                                        }
    REQUIRED.
--topic <String: topic>                 Name of topic for which to perform an election.
                                          REQUIRED Defaultsif to--partition all existing partitionsis specified. Not allowed
                                          if --path-to-json-file or --all-topic-partitions is specified.
--partition <Integer: partition id>     Partition id for which to perform an election.
                                          REQUIRED if --topic is specified. Not allowed if
                                          --path-to-json-file or --all-topic-partitions is specified.         
--help                                  Print usage information.
--path-to-json-file <String: list of    The JSON file with the list of
  partitions for which replica            partitions for which leader election
  leader election needs to be             should be done. Supported elections
  triggered>                              are 0 for preferred and 1 for unclean.
                                          If an election is not specified,
                                          preferred is the default. This is an
                                          example format.
                                        {"partitions":
                                                [{"topic": "foo", "partition": 1},
                                                 {"topic": "foobar", "partition": 2}]
                                        }
                                          Not allowed if --all-topic-partitions, --topic or --partition
                                          flags are specified.

uncleanElectionFromAdminClient || logConfigs(partition.topic).uncleanLeaderElectionEnable.booleanValue()