add content for SCORER param (#1122)

Author: joeywhelan

content/commands/ft.aggregate/index.md

@@ -139,6 +139,14 @@ arguments:
   name: params
   optional: true
   type: block
+- name: scorer
+  optional: true
+  token: SCORER
+  type: string
+- name: addscores
+  optional: true
+  token: ADDSCORES
+  type: pure-token
 - name: dialect
   optional: true
   since: 2.4.3
@@ -173,7 +181,8 @@ syntax: "FT.AGGREGATE index query \n  [VERBATIM] \n  [LOAD count field [field ..
   \ ...]] ...]] \n  [ SORTBY nargs [ property ASC | DESC [ property ASC | DESC ...]]\
   \ [MAX num] [WITHCOUNT] \n  [ APPLY expression AS name [ APPLY expression AS name\
   \ ...]] \n  [ LIMIT offset num] \n  [FILTER filter] \n  [ WITHCURSOR [COUNT read_size]\
-  \ [MAXIDLE idle_time]] \n  [ PARAMS nargs name value [ name value ...]] \n  [ADDSCORES] \n  [DIALECT\
+  \ [MAXIDLE idle_time]] \n  [ PARAMS nargs name value [ name value ...]] \n  [SCORER scorer]\n
+  \ [ADDSCORES] \n  [DIALECT\
   \ dialect]\n"
 syntax_fmt: "FT.AGGREGATE index query [VERBATIM] [LOAD\_count field [field ...]]\n\
   \  [TIMEOUT\_timeout] [LOAD *] [GROUPBY\_nargs property [property ...]\n  [REDUCE\_\
@@ -183,15 +192,15 @@ syntax_fmt: "FT.AGGREGATE index query [VERBATIM] [LOAD\_count field [field ...]]
   name] ...]] ...]]\n  [SORTBY\_nargs [property <ASC | DESC> [property <ASC | DESC>\
   \ ...]]\n  [MAX\_num]] [APPLY\_expression AS\_name [APPLY\_expression AS\_name\n\
   \  ...]] [LIMIT offset num] [FILTER\_filter] [WITHCURSOR\n  [COUNT\_read_size] [MAXIDLE\_\
-  idle_time]] [PARAMS nargs name value\n  [name value ...]]\n  [ADDSCORES]\n  [DIALECT\_dialect]"
+  idle_time]] [PARAMS nargs name value\n  [name value ...]]\n  [SCORER scorer]\n [ADDSCORES]\n  [DIALECT\_dialect]"
 syntax_str: "query [VERBATIM] [LOAD\_count field [field ...]] [TIMEOUT\_timeout] [LOAD\
   \ *] [GROUPBY\_nargs property [property ...] [REDUCE\_function nargs arg [arg ...]\
   \ [AS\_name] [REDUCE\_function nargs arg [arg ...] [AS\_name] ...]] [GROUPBY\_nargs\
   \ property [property ...] [REDUCE\_function nargs arg [arg ...] [AS\_name] [REDUCE\_\
   function nargs arg [arg ...] [AS\_name] ...]] ...]] [SORTBY\_nargs [property <ASC\
   \ | DESC> [property <ASC | DESC> ...]] [MAX\_num]] [APPLY\_expression AS\_name [APPLY\_\
   expression AS\_name ...]] [LIMIT offset num] [FILTER\_filter] [WITHCURSOR [COUNT\_\
-  read_size] [MAXIDLE\_idle_time]] [PARAMS nargs name value [name value ...]] [ADDSCORES] [DIALECT\_\
+  read_size] [MAXIDLE\_idle_time]] [PARAMS nargs name value [name value ...]] [SCORER scorer] [ADDSCORES] [DIALECT\_\
   dialect]"
 title: FT.AGGREGATE
 ---
@@ -316,6 +325,12 @@ defines one or more value parameters. Each parameter has a name and a value.
 You can reference parameters in the `query` by a `$`, followed by the parameter name, for example, `$user`. Each such reference in the search query to a parameter name is substituted by the corresponding parameter value. For example, with parameter definition `PARAMS 4 lon 29.69465 lat 34.95126`, the expression `@loc:[$lon $lat 10 km]` is evaluated to `@loc:[29.69465 34.95126 10 km]`. You cannot reference parameters in the query string where concrete values are not allowed, such as in field names, for example, `@loc`. To use `PARAMS`, set `DIALECT` to `2` or greater than `2`.
 </details>
 
+<details open>
+<summary><code>SCORER {scorer}</code></summary>
+
+uses a [built-in]({{< relref "/develop/interact/search-and-query/advanced-concepts/scoring" >}}) or a [user-provided]({{< relref "/develop/interact/search-and-query/administration/extensions" >}}) scoring function.
+</details>
+
 <details open>
 <summary><code>ADDSCORES</code></summary>