Unify getting fields for aggs, and filter scripted fields for significant terms agg#8734

Merged

spalger merged 11 commits intoelastic:masterfrom

spalger:implement/get-field-options

Oct 27, 2016

Commits on Oct 18, 2016

[aggConfig] unify field option handling
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[tests] fix tests that were improperly using fields
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[logstash_fields] remove sortable and filterable, which do nothing
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[notifier] ensure that notifications are not left around
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[aggParams/field] support aggParamType#scriptable
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[aggConfig] add light validation for aggConfig field param
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Commits on Oct 25, 2016

[aggConfig] restore use of `@timestamp`
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[tests] revert changes to notifier clearing
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[aggType/test] remove unnecessary change
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[aggTypes/fieldParam] move orderby back into condition
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Commits on Oct 27, 2016

[aggParams/field] use a more descriptive warning
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