Update reindex.asciidoc

[antrodrob]

Fix missing quotes on Elastic documentation example, please review the other elastic version documentation.

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[elasticsearchmachine]

@antrodrob please enable the option "Allow edits and access to secrets by maintainers" on your PR. For more information, see the documentation.

[elasticsearchmachine]

Pinging @elastic/es-docs (Team:Docs)

[elasticsearchmachine]

Pinging @elastic/core-docs (Team:Docs)