Fix AggregationFactories.Builder equality and hash regarding order#34005

Merged

hendrikmuhs merged 12 commits intoelastic:masterfrom

hendrikmuhs:fix-aggregationbuilder-equality-and-hash-switch-to-set

Sep 28, 2018

Commits on Sep 27, 2018

Fixes the equals and hash function to ignore the order of aggregations.
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check size of aggregator lists
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add tests for hashCode as well
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remove unused
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refactor to use Set instead of List
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address review comments
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rewrite IT to not depend on order
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change HashSet into LinkedHashSet to preserve order
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improve test coverage of BaseAggregationTestCase
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fix more weak namings
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more foo refactorings
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another foo
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