David Smiley commented on SOLR-9562:

Mosh, I suppose you meant that CloudSolrClient could determine the set of 
collections to be searched at its side and then send them via 
{{collection=....}} That's possible... but if done at the Solr side then 
clients other than Java could leverage this.

> Minimize queried collections for time series alias
> --------------------------------------------------
>                 Key: SOLR-9562
>                 URL: https://issues.apache.org/jira/browse/SOLR-9562
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Eungsop Yoo
>            Priority: Minor
>         Attachments: SOLR-9562-v2.patch, SOLR-9562.patch
> For indexing time series data(such as large log data), we can create a new 
> collection regularly(hourly, daily, etc.) with a write alias and create a 
> read alias for all of those collections. But all of the collections of the 
> read alias are queried even if we search over very narrow time window. In 
> this case, the docs to be queried may be stored in very small portion of 
> collections. So we don't need to do that.
> I suggest this patch for read alias to minimize queried collections. Three 
> parameters for CREATEALIAS action are added.
> || Key || Type || Required || Default || Description ||
> | timeField | string | No | | The time field name for time series data. It 
> should be date type. |
> | dateTimeFormat | string | No | | The format of timestamp for collection 
> creation. Every collection should has a suffix(start with "_") with this 
> format. 
> Ex. dateTimeFormat: yyyyMMdd, collectionName: col_20160927
> See 
> [DateTimeFormatter|https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html].
>  |
> | timeZone | string | No | | The time zone information for dateTimeFormat 
> parameter.
> Ex. GMT+9. 
> See 
> [DateTimeFormatter|https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html].
>  |
> And then when we query with filter query like this "timeField:\[fromTime TO 
> toTime\]", only the collections have the docs for a given time range will be 
> queried.

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