Fix a typo in the index layout documentation

Description

https://docs.jboss.org/hibernate/search/6.0/reference/en-US/html_single/#backend-elasticsearch-indexlayout

The timestamp shown in the example is in 2020, while we use a date in 2017.

Environment

None

Assignee

Yoann Rodière

Reporter

Yoann Rodière

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Pull Request

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Priority

Major
Configure