@ElementCollection()
public java.util.List<Context> getContext()

@Embeddable
public class Context implements java.io.Externalizable {
    private Type _type=Type.Conversation;
    private String _value=null;
    .....
    // suitable accessors and modifiers for these two fields
}

Leads to

{ "_id" : { "unitId" : "au1", "unitIndex" : 0 }, "context" : [    {    "context.collection&&element.type" : 2,    "context.collection&&element.value" : "corr1" },    {    "context.collection&&element.type" : 0,    "context.collection&&element.value" : "12345" } ], "properties" : [    {    "name" : "customer",    "value" : "Fred" },    {    "name" : "trader",    "value" : "Joe" } ] }

collection&&element should not be there.

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