@Override
    public String toString() {
        return "SingleFieldPath{" +
            "version=" + version +
            ", path=" + String.join(".", steps) +
            '}';
    }
Access a value at the current path within a schemaless {@code Map<String, Object>}.
If object is not found, then {@code null} is returned.
connect/transforms/src/main/java/org/apache/kafka/connect/transforms/field/SingleFieldPath.java