Dennis Gove commented on SOLR-9077:

It might be necessary to do that in each source stream, though a centralized 
location might be better. The StreamFactory could be a place to store the 
aliases after looking them up but I'm not 100% sure that's the best place.

> Streaming expression in solr doesnot support collection alias
> -------------------------------------------------------------
>                 Key: SOLR-9077
>                 URL: https://issues.apache.org/jira/browse/SOLR-9077
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 5.5.1
>            Reporter: Suds
>            Priority: Minor
> Streaming expression in solr does not support collection alias
> when I tried to access collection alias I get null pointer exception 
> issue seems to be related to following code , clusterState.getActiveSlices 
> returns null 
>  Collection<Slice> slices = clusterState.getActiveSlices(this.collection);
>  for(Slice slice : slices) {
> }
> fix seems to fairly simple , clusterState.getActiveSlices can be made aware 
> of collection alias. I am not sure what will happen when we have large alias 
> which has hundred of slices.

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