copyDocuments: If true, this instance will perform a deep copy of all provided documents before
composing the output. If false, then changes made to provided documents after they are
contributed will be reflected in the next time output is composed.
ignoreDuplicateProperties: If true, then duplicate properties are skipped if they are seen in
contributed documents. If false, then throw when duplicate properties are seen in contributed
documents.
Options for DocumentCombiner objects
copyDocuments: If true, this instance will perform a deep copy of all provided documents before composing the output. If false, then changes made to provided documents after they are contributed will be reflected in the next time output is composed.ignoreDuplicateProperties: If true, then duplicate properties are skipped if they are seen in contributed documents. If false, then throw when duplicate properties are seen in contributed documents.