private FieldValue getDate(final Condition condition, final String fieldName, final String value) {
        return FieldValue.of(DateExpressionParser.getMs(fieldName, value, dateTimeSettings));
    }
Split an expression into is component terms. Useful for extracting terms for use with "in" or "contains"
conditions

@param expression - Example: "1,2, 3"
@return - Stream of terms. Example: [ "1", "2", "3" ]
stroom-search/stroom-search-elastic/src/main/java/stroom/search/elastic/search/SearchExpressionQueryBuilder.java