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Document time unit limitations for date histograms #30177

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Apr 26, 2018
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Document time unit limitations for date histograms #30177

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6 changes: 4 additions & 2 deletions docs/reference/aggregations/bucket/datehistogram-aggregation.asciidoc
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Expand Up @@ -27,11 +27,13 @@ POST /sales/_search?size=0
// CONSOLE
// TEST[setup:sales]

Available expressions for interval: `year`, `quarter`, `month`, `week`, `day`, `hour`, `minute`, `second`
Available expressions for interval: `year` (`1y`), `quarter` (`1q`), `month` (`1M`), `week` (`1w`),
`day` (`1d`), `hour` (`1h`), `minute` (`1m`), `second` (`1s`)

Time values can also be specified via abbreviations supported by <<time-units,time units>> parsing.
Note that fractional time values are not supported, but you can address this by shifting to another
time unit (e.g., `1.5h` could instead be specified as `90m`).
time unit (e.g., `1.5h` could instead be specified as `90m`). Also note that time intervals larger than
than days do not support arbitrary values but can only be one unit large (e.g. `1y` is valid, `2y` is not).

[source,js]
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