make aggregate() easier to use for the common case
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                 Key: CAMEL-3855
                 URL: https://issues.apache.org/jira/browse/CAMEL-3855
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
            Reporter: Ben O'Day
            Assignee: Ben O'Day
            Priority: Minor


Currently, an expression and strategy are required to use aggregate().  
Perhaps, we could set a default expression (constant(true), etc) and strategy 
(either groupExchanges() or the attached AggregateAsListStrategy, etc).

For example, either of these could make a good intuitive default (still 
requiring a completionSize/Interval, etc)

aggregate() == aggregate(constant(true)).groupExchanges() 
or
aggregate() == aggregate(constant(true), new AggregateAsListStrategy())

See this discussion for more 
information....http://camel.465427.n5.nabble.com/Default-Behavior-for-aggregate-td4296790.html

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