Add javadoc to note 2 classes Whitelist and WhitelistConstructor shou…

…ld be final

Signed-off-by: Tianli Feng <ftianli@amazon.com>

modules/lang-painless/spi/src/main/java/org/opensearch/painless/spi/Whitelist.java

@@ -43,12 +43,12 @@
  * constructors, methods, and fields that can be used within a Painless script at both compile-time
  * and run-time.
  *
- * A Allowlist consists of several pieces with {@link WhitelistClass}s as the top level. Each
+ * An Allowlist consists of several pieces with {@link WhitelistClass}s as the top level. Each
  * {@link WhitelistClass} will contain zero-to-many {@link WhitelistConstructor}s, {@link WhitelistMethod}s, and
  * {@link WhitelistField}s which are what will be available with a Painless script.  See each individual
  * allowlist object for more detail.
  *
- * @deprecated As of 2.2, because supporting inclusive language, replaced by {@link Allowlist}
+ * @deprecated As of 2.2, because supporting inclusive language, replaced by {@link Allowlist}. The class was declared with final keyword.
  */
 @Deprecated
 public class Whitelist {

modules/lang-painless/spi/src/main/java/org/opensearch/painless/spi/WhitelistConstructor.java

@@ -45,7 +45,7 @@
  * constructors for Java classes are using the 'new' keyword. Painless classes may have multiple
  * constructors as long as they comply with arity overloading described for {@link WhitelistClass}.
  *
- * @deprecated As of 2.2, because supporting inclusive language, replaced by {@link AllowlistConstructor}
+ * @deprecated As of 2.2, because supporting inclusive language, replaced by {@link AllowlistConstructor}. The class was declared with final keyword.
  */
 @Deprecated
 public class WhitelistConstructor {
@@ -63,7 +63,7 @@ public class WhitelistConstructor {
     public final Map<Class<?>, Object> painlessAnnotations;
 
     /** Standard constructor. All values must be not {@code null}. */
-    WhitelistConstructor(String origin, List<String> canonicalTypeNameParameters, List<Object> painlessAnnotations) {
+    public WhitelistConstructor(String origin, List<String> canonicalTypeNameParameters, List<Object> painlessAnnotations) {
         this.origin = Objects.requireNonNull(origin);
         this.canonicalTypeNameParameters = Collections.unmodifiableList(Objects.requireNonNull(canonicalTypeNameParameters));