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[DOCS] Added forecast limitations (elastic/x-pack-elasticsearch#3503) 

Original commit: elastic/x-pack-elasticsearch@b4aae8f4db
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Lisa Cawley 2018-01-11 10:08:15 -08:00 committed by GitHub
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docs/en/ml/limitations.asciidoc
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@ -171,3 +171,24 @@ associated with the original roles.
A way to update the roles stored within the {dfeed} without changing any other A way to update the roles stored within the {dfeed} without changing any other
settings is to submit an empty JSON document (`{}`) to the settings is to submit an empty JSON document (`{}`) to the
{ref}/ml-update-datafeed.html[update {dfeed} API]. {ref}/ml-update-datafeed.html[update {dfeed} API].
[float]
=== Forecasts cannot be created for population jobs
If you use an `over_field_name` property in your job (that is to say, it's a
_population job_), you cannot create a forecast. If you try to create a forecast
for this type of job, an error occurs. For more information about forecasts,
see <<ml-forecasting>>.
[float]
=== Forecasts cannot be created for jobs that use geographic, rare, or time functions
If you use any of the following analytical functions in your job, you cannot
create a forecast:
* `lat_long`
* `rare` and `freq_rare`
* `time_of_day` and `time_of_week`
If you try to create a forecast for this type of job, an error occurs. For more
information about any of these functions, see <<ml-functions>>.