Could not parse field as address list field must either be a string – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch is unable to parse a field as an address list because the field is not in the correct format. The field must be a string or an array of strings. To resolve this issue, you should check the format of the field causing the error. Ensure that it is either a single string or an array of strings. If it’s not, you need to convert it to the correct format before Elasticsearch can parse it.

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This guide will help you check for common problems that cause the log ” could not parse [” + field + “] as address list. field must either be a string ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “could not parse [” + field + “] as address list. field must either be a string ” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
 addresses.add(Address.parse(field; token; parser));
 return new Email.AddressList(addresses);
 throw new ElasticsearchParseException("could not parse [" + field + "] as address list. field must either be a string " +
 "(comma-separated list of RFC822 encoded addresses) or an array of objects representing addresses");
 }  @Override
 public boolean equals(Object o) {


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