Make SpanQuery non exhaustive, as they can be extended with plugins (#2509) (#2510)

(cherry picked from commit 792195a)

Co-authored-by: Sylvain Wallez <[email protected]>

Author: 2 people

output/schema/schema.json

@@ -76,7 +76,10 @@ export class SpanWithinQuery extends QueryBase {
   little: SpanQuery
 }
 
-/** @variants container */
+/**
+ * @variants container
+ * @non_exhaustive
+ */
 export class SpanQuery {
   span_containing?: SpanContainingQuery
   field_masking_span?: SpanFieldMaskingQuery