Briefly, this error occurs when the week day value provided in a query or data input is not recognized by Elasticsearch. It expects a string or number value, or an array of these. To resolve this, ensure that the week day value is correctly formatted as a string or number. If it’s an array, make sure all elements are valid. Also, check if the field is correctly mapped to accept the provided values. If not, you may need to reindex your data with the correct mapping.
This guide will help you check for common problems that cause the log ” invalid week day value for [{}] field. expected string/number value or an ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “invalid week day value for [{}] field. expected string/number value or an” class name is WeekTimes.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} else if (token == XContentParser.Token.START_ARRAY) {
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
daysSet.add(parseDayValue(parser; token));
}
} else {
throw new ElasticsearchParseException("invalid week day value for [{}] field. expected string/number value or an " +
"array of string/number values; but found [{}]"; currentFieldName; token);
}
} else if (TIME_FIELD.match(currentFieldName; parser.getDeprecationHandler())) {
if (token != XContentParser.Token.START_ARRAY) {
try {
