According to the StatsComponent, you can pass stats.field several times to get them all at the same request, for example. stats.field=price&stats.field=popularity
eg http://localhost:8983/solr/select?q=*:*&stats=true&stats.field=price&stats.field=popularity&rows=0&indent=true
You can also pass multiple facet fields, for example. stats.facet=inStock&stats.facet=popularity
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