Consider the following query:

QueryBuilder monthQb = ...
monthQb.keyword()
.onField( "estimatedCreation" )
.matching( new GregorianCalendar( 1958, 3, 2 ) )
.createQuery();

This will fail upon execution if the field is indexed numerically:

The specified query 'estimatedCreation:-2202940800000' contains a string based sub query which targets the numeric encoded field(s) 'estimatedCreation'

ConnectedMultiFieldsTermQueryBuilder.createQuery(FieldContext, ConversionContext) only creates exact numeric match queries for NumericFieldBridge instances, but it also should do so for NumericEncodingCalendarBridge and NumericEncodingDateBridge.