The Field Facet query pipeline stage is used to add a link:Solr Field Facet query to the search query pipeline. A field facet query computes the top values for a field and returns the list of those values along with a count of the subset of documents in the search results which match that term. Field faceting works best over fields which contain a single label or set of labels from a finite, controlled lexicon such as product category. Facet field parameters can be tuned for performance, see: Facet Field Configuration. It is possible to specify more than one field facets. For each field facet you must specify the field name plus the following additional parameters:
  • Limit. The maximum number of terms to be returned. Default 100.
  • Offset. The number of top facet values to skip in the response. Default 0.
  • Sort. The order in which to list facet values: count ordering is by documents per term, descending, and index ordering is sorted on term values themselves.
  • Missing. The number of documents in the results set which have no value for the facet field.
  • Choice of facet method (advanced). Specify Solr algorithm used to calculate facet counts. (See Facet Method Configuration for details)
    One of:
    • enum. Small number of distinct categories.
    • fc (“field cache”). Many different values in the field, each document has low number of values, multi-valued field.
    • fcs (“single value string fields”). Good for rapidly changing indexes.
For further details see: Solr Faceting Overview.
LucidAcademyLucidworks offers free training to help you get started.The Course for Faceting focuses on how to use facets to ensure faster, smarter search results:
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Query pipeline stage condition examples

Stages can be triggered conditionally when a script in the Condition field evaluates to true. Some examples are shown below. Run this stage only for mobile clients: 
params.deviceType === "mobile"
Run this stage when debugging is enabled: 
params.debug === "true"
Run this stage when the query includes a specific term: 
params.q && params.q.includes("sale")
Run this stage when multiple conditions are met: 
request.hasParam("fusion-user-name") && request.getFirstParam("fusion-user-name").equals("SuperUser");
!request.hasParam("isFusionPluginQuery")
The first condition checks that the request parameter “fusion-user-name” is present and has the value “SuperUser”. The second condition checks that the request parameter “isFusionPluginQuery” is not present.

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Configuration