[BUG] MultiSearchTemplateResponse does not return a status field

[VachaShah]

Describe the bug
Coming from opensearch-project/opensearch-java#708, the server does not return status as a field for MultiSearchTemplate requests. Though, it returns status for MultiSearch responses.

To Reproduce
Steps to reproduce the behavior:

1. Send msearch and msearch_template requests to the server to notice the missing field.

Expected behavior
The server should return the status for MultiSearchTemplate requests.

Plugins
N/A

Screenshots
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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
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