code: public AsyncLookupInBuilder get(String path, SubdocOptionsBuilder optionsBuilder) {
          if (path == null) {
              throw new IllegalArgumentException("Path is mandatory for subdoc get");
          }
          if (optionsBuilder.createPath()) {
              throw new IllegalArgumentException("Options createPath are not supported for lookup");
          }
          this.specs.add(new LookupSpec(Lookup.GET, path, optionsBuilder));
          return this;
      }
docs: Get a value inside the JSON document.
  
  @param path the path inside the document where to get the value from.
  @param optionsBuilder {@link SubdocOptionsBuilder}
  @return this builder for chaining.