Merge pull request #17 from optimdata/pollux-11720-hotfix

Pollux #11781 Hotfix vega preview with missing fields

Merge pull request #15 from optimdata/elastic8

Support of elastic8 and elastic6

Merge pull request #12 from optimdata/pollux-9519

Pollux #9519 hotfix pybana for on_batch_finished

Merge pull request #9 from optimdata/pybana-8

Pybana #8 Loosened pytz requirement

fix: Escale metric label

fix: Fix line plot when some values are missing

fix: Fix `ContextVisualization.is_duration_agg`

feat: Support duration formatting for axes corresponding to a duratio…

…n serie

We assume that
- an axis represents a duration if the first serie associated to the axis is a duration.
- a serie is considered as a "duration" if it's formatted as a number with a format like '00:00:00'

fix: Support vega viz without data.url attribute

fix: Fix terms custom metric