Tal Levy eda4964f64
Add rollover-creation-date setting to rolled over index (#31144)
This commit introduces a new property to IndexMetaData called
RolloverInfo. This object contains a map containing the aliases
that were used to rollover the related index, which conditions
were met, and at what time the rollover took place.

much like the `index.creation_date`, it captures the approximate time
that the index was rolled over to a new one.
2018-06-15 08:44:29 -07:00
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