Create Workload Improvement: Multi-Process Index Extraction

[IanHoang]

Is your feature request related to a problem? Please describe.

When using OpenSearch Benchmark's create-workload feature to extract data from clusters, users often extract more than one index. For example, a user might have a cluster comprised of 5 indices and OSB will extract each corpora in order. This is a time consuming process and can be more efficient. For larger sets of data, this can also lead to read timeouts like below:

[ERROR] Cannot create-workload. ConnectionTimeout caused by - ReadTimeoutError(HTTPSConnectionPool(host='<example host endpoint>', port=443): Read timed out. (read timeout=10)).

Describe the solution you'd like

To expedite the process and make it more efficient, OSB can use N number of processes to extract N number of indices.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.

[AkshathRaghav]

@IanHoang 👋🏽, I've opened a PR for this -> #403