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The pattern used to select the indexes to receive queries from the search.
By changing the pattern you can change the index or even select multiple indexes ( * wildcard ) Example: logstash-*
Changing this setting will impact this search, the searches derived from this and all the associated visual components.

Patterns allow you to define dynamic index names. Static text in an index name is denoted using brackets. Example: [logstash-]YYYY.MM.DD. Please note that weeks are setup to use ISO weeks which start on Monday. — Date Format Documentation

Note:  I noticed you are using weekly indices. Siren Investigate requires ISO weeks be used in your index creation. See Wikipedia: ISO Week Date