MOTIVATION
customers would like to specify a type field other than _class, and
would like to specify a type field value other than the class name
of the domain object
CHANGES
Follow the instructions at
https://stackoverflow.com/questions/38847605/how-to-use-spring-data-with-couchbase-without-class-attribute
in the test domain, supply a CustomMappingCouchbaseConvert class that leverates a
TypeBasedCouchbaseTypeMapper, which in turn uses a TypeAwareTypeInformationMapper.
The typeKey used is "t". The TypeAwareTypeInformationMapper uses the DocumentType annotation
as the value for the type map entry. The domain Person object has @DocumentType("p"), which
will result in type mapping of "t" : "p" for Person objects.
In addition, when a query is composed, the typeKey and typeValue are taken from the converter.
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