docs: fix Simple README

[tadejsv]

What is this bug?

[cristianmtr]

It wasn't a bug. It had something to do with the workspace not being saved at container shutdown, when using it with jinahub+docker.

[tadejsv]

Okay. And is there any fix that can be done for that? Since SimpleIndexer will probably be one of the most used executors, we should enable its use in a Docker container

[cristianmtr]

Again, not sure it was an actual bug.

This works

import numpy as np

from jina import Flow, Document

f = Flow().add(
    uses='jinahub+docker://SimpleIndexer',
    uses_with={'index_file_name': 'name'},
    uses_metas={'workspace': '/inner_workspace'},
    volumes=['workspace:/inner_workspace']
)

with f:
    resp = f.post(
        on='/index',
        inputs=[Document(id='a', embedding=np.array([1]))],
        return_results=True,
    )

with f:
    resp = f.post(
        on='/search',
        inputs=[Document(embedding=np.array([1]))],
        return_results=True,
        parameters={'top_k': 5},
    )
    assert resp[0].docs[0].matches[0].id == 'a'

[tadejsv]

Okay, we should then also have a ticket to fix this issue

[cristianmtr]

Okay, we should then also have a ticket to fix this issue

What issue? It works. Might have been fixed in the meantime, if it was a problem

[tadejsv]

Ah my bad, I thought you were adding the warning.