code: public Post blogPost(String blogName, Long postId) {
          HashMap<String, String> options = new HashMap<String, String>();
          options.put("id", postId.toString());
          List<Post> posts = this.blogPosts(blogName, options);
          return posts.size() > 0 ? posts.get(0) : null;
      }
docs: Get an individual post by id
  @param blogName the name of the blog
  @param postId the id of the post to get
  @return the Post or null