Update dependency fluent-plugin-elasticsearch to v5.4.2

This MR contains the following updates:

Package	Update	Change
fluent-plugin-elasticsearch (changelog)	minor	5.3.0 -> 5.4.2

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Release Notes

uken/fluent-plugin-elasticsearch (fluent-plugin-elasticsearch)

v5.4.2

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v5.4.1

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• in_elasticsearch: Avoid to use deprecated endpoint for clear_scroll (#​1039)

v5.4.0

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• Fix support for host/hosts placeholders for ipv6 addresses (#​1030)
• Handle newer es library (#​1032)

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