Briefly, this error occurs when Elasticsearch expects an array data type for a specific field, but it receives a different data type. This mismatch can happen during indexing or updating documents. To resolve this, ensure that the data type of the field matches the expected array data type. You can do this by checking your data before indexing or updating. Alternatively, you can modify your mapping to match the data type of the incoming data. However, be aware that modifying mapping requires reindexing of data.
This guide will help you check for common problems that cause the log ” expected array for [” + currentFieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “expected array for [” + currentFieldName + “]” class name is AbstractRepository.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (parser.nextToken() == XContentParser.Token.START_ARRAY) {
while (parser.nextToken() != XContentParser.Token.END_ARRAY) {
incompatibleSnapshotIds.add(snapshotIdFromXContent(parser));
}
} else {
throw new ElasticsearchParseException("expected array for [" + currentFieldName + "]");
}
} else {
throw new ElasticsearchParseException("unknown field name [" + currentFieldName + "]");
}
}
