Christoph Büscher 44193e7ba5 Aggregations: Add 'offset' option to histogram aggregation
Histogram aggregation supports an 'offset' option to move bucket boundaries.
In a histogram with buckets of size X these can be moved from 0, X, 2X, 3X,...
by an offset value of Y to Y, X+Y, 2X+Y, 3X+Y... by using the 'offset' option.
The previous 'pre_offset' and 'post_offset' options are removed in favour of
the simplified 'offset' option.

Closes #9417
Closes #9505
2015-02-02 18:23:01 +01:00
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