adding json schema for extractor (#3240)

* adding json schema for extractor

* adding argument validation

v2/cmd/docgen/docgen.go

@@ -21,6 +21,11 @@ func main() {
 	if err != nil {
 		log.Fatalf("Could not encode docs: %s\n", err)
 	}
+
+	if len(os.Args) < 3 {
+		log.Fatalf("syntax: %s md-docs-file jsonschema-file\n", os.Args[0])
+	}
+
 	err = os.WriteFile(os.Args[1], data, 0644)
 	if err != nil {
 		log.Fatalf("Could not write docs: %s\n", err)

v2/pkg/operators/extractors/extractors.go

@@ -90,7 +90,7 @@ type Extractor struct {
 
 	// description: |
 	//   Extracts using DSL expressions.
-	DSL         []string
+	DSL         []string `yaml:"dsl,omitempty" jsonschema:"title=dsl expressions to extract,description=Optional attribute to extract from response dsl"`
 	dslCompiled []*govaluate.EvaluableExpression
 
 	// description: |