Duplicate facets when the handler configuration specifies facet fields

[Burke, Brian]

We’ve run into an issue during local testing of the 4.10.2 release,  where if 
the search handler config in solrconfig.xml has facet.fields defined, and a 
different field is on the request, then the requested facets are included twice 
in the response.  If the list of default facet fields is removed from the 
handler config, no dupes are returned.

Is this configuration in solrconfig.xml not supported, or incorrect in some way?

Here’s an excerpt from the solrconfig.xml (for the default search handler):

….
                <str name='facet'>true</str>
                <str name='facet.field'>typedef</str>
                <str name='f.typedef.facet.limit'>15</str>
                <str name='facet.field'>subtype</str>
                <str name='f.subtype.facet.limit'>15</str>
                <str name='facet.mincount'>1</str>
…

And when requesting facets on another field with this request:


Produces this result, with the facets listed twice: 
http://ctestserver/solr/core12/select?q=*:*&rows=0&wt=json&indent=true&facet=true&facet.field=primaryId&facet.limit=10


{
  "responseHeader":{
    "status":0,
    "QTime":19,
    "params":{
      "facet":"true",
      "indent":"true",
      "q":"*:*",
      "facet.limit":"10",
      "facet.field":"primaryId",
      "wt":"json",
      "rows":"0"}},
  "response":{"numFound":3365954,"start":0,"docs":[]
  },
  "facet_counts":{
    "facet_queries":{},
    "facet_fields":{
      "primaryId":[
        "c7e512f03d300310VgnVCM1000000d01c80aRCRD",81047,
        "2f4e68c8f24f3310VgnVCM1000000d01c80aRCRD",34239,
        "cfe3d14b917e1210VgnVCM1000000d01c80aRCRD",16719,
        "0c88cd4fb27e1210VgnVCM1000000d01c80aRCRD",14179,
        "c4e39262b57e1210VgnVCM1000000d01c80aRCRD",10983,
        "98a13bc7f1c96310VgnVCM1000000d01c80aRCRD",10504,
        "69cb2c4c9c6e1210VgnVCM1000000d01c80aRCRD",10232,
        "435dd953c2772210VgnVCM1000000d01c80aRCRD",9250,
        "23a89ce3f561f110VgnVCM1000009d2916acRCRD",9024,
        "f4e6fc42247e1210VgnVCM1000000d01c80aRCRD",8022],
      "primaryId":[
        "c7e512f03d300310VgnVCM1000000d01c80aRCRD",81047,
        "2f4e68c8f24f3310VgnVCM1000000d01c80aRCRD",34239,
        "cfe3d14b917e1210VgnVCM1000000d01c80aRCRD",16719,
        "0c88cd4fb27e1210VgnVCM1000000d01c80aRCRD",14179,
        "c4e39262b57e1210VgnVCM1000000d01c80aRCRD",10983,
        "98a13bc7f1c96310VgnVCM1000000d01c80aRCRD",10504,
        "69cb2c4c9c6e1210VgnVCM1000000d01c80aRCRD",10232,
        "435dd953c2772210VgnVCM1000000d01c80aRCRD",9250,
        "23a89ce3f561f110VgnVCM1000009d2916acRCRD",9024,
        "f4e6fc42247e1210VgnVCM1000000d01c80aRCRD",8022]},
    "facet_dates":{},
    "facet_ranges":{},
    "facet_intervals":{}}}


Any suggestions on how to eliminate these duplicates would be most appreciated.
Thanks,
Brian