SearchIndex.replace_all_objects is stuck when using "safe" mode

[r0ro]

• Algolia Client Version: 2.2.0
• Language Version: Python 3.7

Description

When using replace_all_objects with request_options 'safe' = True then operation never completes

Steps To Reproduce

    client = SearchClient.create(ALGOLIA_APPLICATION_ID, ALGOLIA_WRITE_API_KEY)
    dev = client.init_index("dev_test")
    dev.save_object({
        'objectID': 'test-0',
        'title': 'just a test'
    })

    dev.replace_all_objects([{
        'objectID': 'test-1',
        'title': 'another test'
    }], {
        'safe': True
    })