elasticsearch/kibana — pull request #612 by jdve (2013-10-25 15:21:08+00:00)
Title: histogram: option to enable/disable zero-fill

For some graph types (particularly point style), it's useful to
explicitly avoid filling missing data points with zeros. For example,
when plotting the min/max/mean value of a particular field, filling with
zeros might present the wrong picture of the data, since the value is
not actually zero but simply missing.