Pipeline option example:
Examples in Java, Python and Go are not consistent. Java has myCustomOption, while Python and Go have "input" and "output".
When Python is chosen, the doc says --myCustomOption=value is supported, which only corresponds to the java example.
Reading from external source:
Java, Python and Go are not consistent. Python example reads from a GCS file, while others specify a generic file.
https://beam.apache.org/documentation/programming-guide/#applying-transforms: The last workflow graph does not correspond to the code example.