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@@ -822,7 +822,7 @@ This is because the date is being rounded by month.
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| Name | Required | Default | Description
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| `field` | yes | - | The field to get the date or timestamp from.
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| `index_name_prefix` | no | - | A prefix of the index name to be prepended before the printed date.
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-| `date_rounding` | yes | - | How to round the date when formatting the date into the index name. Valid values are: `y` (year), `m` (month), `w` (week), `d` (day), `h` (hour), `m` (minute) and `s` (second).
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+| `date_rounding` | yes | - | How to round the date when formatting the date into the index name. Valid values are: `y` (year), `M` (month), `w` (week), `d` (day), `h` (hour), `m` (minute) and `s` (second).
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| `date_formats ` | no | yyyy-MM-dd'T'HH:mm:ss.SSSZ | An array of the expected date formats for parsing dates / timestamps in the document being preprocessed. Can be a Joda pattern or one of the following formats: ISO8601, UNIX, UNIX_MS, or TAI64N.
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| `timezone` | no | UTC | The timezone to use when parsing the date and when date math index supports resolves expressions into concrete index names.
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| `locale` | no | ENGLISH | The locale to use when parsing the date from the document being preprocessed, relevant when parsing month names or week days.
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Martijn van Groningen