[Bug] Elasticsearch analyzer "keys" field is required but should not be

[gaistou]

Describe the bug

The description of the analyzer says that the "keys" param is not required. However, leaving it empty when running the analyzer with a local config files generates an error.

To Reproduce

• create a local input.json file without a "keys" field
• run the analyzer with the local input.json
• you get a "cannot iterate on None type" error

Expected behavior

The missing "keys" param should not generate an error.

Complementary information

The issue comes from the "zip" function call on index,keys,users, and passwords.

Work environment

• Cortex Analyzer/Responder name: ElasticSearch
• Cortex Analyzer/Responder version: 1.0