Using Multiple collections with streaming expressions

[ufuk yılmaz]

For example the streaming expression significantTerms:

https://lucene.apache.org/solr/guide/8_4/stream-source-reference.html#significantterms


significantTerms(collection1,
                 q="body:Solr",
                 field="author",
                 limit="50",
                 minDocFreq="10",
                 maxDocFreq=".20",
                 minTermLength="5")

Solr supports querying multiple collections at once, but I can’t figure  out 
how I can do that with streaming expressions.
When I try enclosing them in quotes like:

significantTerms(“collection1, collection2”,
                 q="body:Solr",
                 field="author",
                 limit="50",
                 minDocFreq="10",
                 maxDocFreq=".20",
                 minTermLength="5")

It gives the error: "EXCEPTION":"java.io.IOException: Slices not found for \" 
collection1, collection2\""
I think Solr thinks quotes as part of the collection names, hence it can’t find 
slices for it.

When I just use it without quotes:
significantTerms(collection1, collection2,…
It gives the error: "EXCEPTION":"invalid expression 
significantTerms(collection1, collection2, …

I tried single quotes, escaping the quotation mark but nothing Works…

Any ideas?

Best, ufuk

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