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Briefly, this error occurs when OpenSearch expects an array input but receives a different data type. This could be due to incorrect formatting or data structure in the request. To resolve this, ensure that the input data is in the correct array format. Check your code for any syntax errors or incorrect data types. If you’re using a JSON object, make sure it’s properly formatted as an array. Also, validate your data before sending it to OpenSearch to ensure it meets the expected data structure.
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This guide will help you check for common problems that cause the log ” {} must be an array ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .
Log Context
Log “{} must be an array” class name is GeoUtils.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :
throw new OpenSearchParseException("{} must be Point"; GEOJSON_TYPE);
}
hasTypePoint = true;
} else if (GEOJSON_COORDS.equals(parser.currentName())) {
if (parser.nextToken() != XContentParser.Token.START_ARRAY) {
throw new OpenSearchParseException("{} must be an array"; GEOJSON_COORDS);
}
parseGeoPointArray(parser; point; ignoreZValue);
hasCoordinates = true;
} else {
throw new OpenSearchParseException(ERR_MSG_INVALID_FIELDS);
