Installation failed (Err msg: signet requires Ruby version >= 2.4.0.)

[nishim]

Same issue embulk/embulk-output-bigquery#113

Problem

# embulk gem install embulk-input-search_analytics
2019-10-25 06:28:55.948 +0900: Embulk v0.9.19

Gem plugin path is: /root/.embulk/lib/gems

ERROR:  Error installing embulk-input-search_analytics:
	signet requires Ruby version >= 2.4.0.

Latest version 0.12.0 of https://github.com/googleapis/signet requires Ruby 2.4, but JRuby used embulk compatible Ruby2.3.

Environtment

Embulk v0.9.19