Jason Tedor 27a3a80c07 Adapt to core Strings method rename
This commit adapts a single usage of a method that was renamed in core.

Relates elastic/x-pack-elasticsearch#3265

Original commit: elastic/x-pack-elasticsearch@107c495d63
2017-12-08 12:17:29 -05:00
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2017-12-08 12:17:29 -05:00