Getting max bytes length exceeded exception error, how to fix and prevent?

How can I fix this, please? Also, using Logstash, and is there a way to prevent this going forward?

Elasticsearch 6.3.2
Logstash 6.3.2

[2019-01-10T08:17:20,763][DEBUG][o.e.a.s.TransportSearchAction] [lmpau0629] [3259244] Failed to execute fetch phase
org.elasticsearch.transport.RemoteTransportException: [yyyyyy][][indices:data/read/search[phase/fetch/id]]
Caused by: max_bytes_length_exceeded_exception: bytes can be at most 32766 in length; got 56515


All of the keyword fields have the ignore_above setting.

    "message": {
      "type": "text",
      "fields": {
        "keyword": {
          "type": "keyword",
          "ignore_above": 256

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