fix(synonym): fix delete response of synonym

Author: tharropoulos

src/main/java/org/typesense/api/Synonym.java

@@ -2,6 +2,7 @@
 
 import org.typesense.api.utils.URLEncoding;
 import org.typesense.model.SearchSynonym;
+import org.typesense.model.SearchSynonymDeleteResponse;
 
 public class Synonym {
 
@@ -19,8 +20,8 @@ public SearchSynonym retrieve() throws Exception {
         return this.apiCall.get(this.getEndpoint(), null, SearchSynonym.class);
     }
 
-    public SearchSynonym delete() throws Exception {
-        return this.apiCall.delete(this.getEndpoint(), null, SearchSynonym.class);
+    public SearchSynonymDeleteResponse delete() throws Exception {
+        return this.apiCall.delete(this.getEndpoint(), null, SearchSynonymDeleteResponse.class);
     }
 
     public String getEndpoint() {