In this code:

					.property( "price", ElementType.FIELD )
						.field()
							.store( Store.YES )
							.numericField().precisionStep( 10 )

... The call to numericField adds a new field with the exact same name, erasing all previous information, for example the call to store( Store.YES ).

This is because NumericFieldMapping extends FieldMapping, which adds a new field in its constructor. It never should have extended FieldMapping, but as NumericFieldMapping is API, it'll have to stay that way. We'll have to find a workaround...