[DOCS] Rewrite constant_score query (#43374)

docs/reference/query-dsl/constant-score-query.asciidoc

@@ -1,12 +1,12 @@
 [[query-dsl-constant-score-query]]
 === Constant Score Query
 
-A query that wraps another query and simply returns a
-constant score equal to the query boost for every document in the
-filter. Maps to Lucene `ConstantScoreQuery`.
+Wraps a <<query-dsl-bool-query, filter query>> and returns every matching
+document with a <<query-filter-context, relevance score>> equal to the `boost`
+parameter value.
 
 [source,js]
---------------------------------------------------
+----
 GET /_search
 {
     "query": {
@@ -18,8 +18,22 @@ GET /_search
         }
     }
 }
---------------------------------------------------
+----
 // CONSOLE
 
-Filter clauses are executed in <<query-filter-context,filter context>>,
-meaning that scoring is ignored and clauses are considered for caching.
+[[constant-score-top-level-params]]
+==== Top-level parameters for `constant_score`
+`filter`::
++
+--
+<<query-dsl-bool-query, Filter query>> you wish to run. Any returned documents
+must match this query. Required.
+
+Filter queries do not calculate <<query-filter-context, relevance scores>>. To
+speed up performance, {es} automatically caches frequently used filter queries.
+--
+
+`boost`::
+Floating point number used as the constant <<query-filter-context, relevance
+score>> for every document matching the `filter` query. Default is `1.0`.
+Optional.