build

chore: keep compatibility with ruby 2.6 #91

Job	Run time
build (2.6.10, gemfiles/Gemfile.elasticsearch-1.x, elasticsearch:1.7.6, 1.7.6, true)	1m 36s
build (2.6.10, gemfiles/Gemfile.elasticsearch-2.x, elasticsearch:2.4.6, 2.4.6, true)	1m 38s
build (2.6.10, gemfiles/Gemfile.elasticsearch-5.x, elasticsearch:5.6.16, 5.6.16, true)	1m 43s
build (2.7.7, gemfiles/Gemfile.elasticsearch-6.x, elasticsearch:6.8.16, 6.8.16, false)	1m 35s
build (2.7.7, gemfiles/Gemfile.elasticsearch-7.x, elasticsearch:7.13.2, 7.13.2, false)	1m 35s
build (3.0.7, gemfiles/Gemfile.elasticsearch-7.x, elasticsearch:7.13.2, 7.13.2, false)	1m 28s
build (3.1.6, gemfiles/Gemfile.elasticsearch-7.x, elasticsearch:7.13.2, 7.13.2, false)	1m 20s
build (3.2.4, gemfiles/Gemfile.elasticsearch-7.x, elasticsearch:7.13.2, 7.13.2, false)	1m 20s
build (3.3.3, gemfiles/Gemfile.elasticsearch-7.x, elasticsearch:7.13.2, 7.13.2, false)	1m 20s
build (3.0.7, gemfiles/Gemfile.elasticsearch-8.x, elasticsearch:8.4.2, 8.4.2, false)	1m 22s
build (3.1.6, gemfiles/Gemfile.elasticsearch-8.x, elasticsearch:8.4.2, 8.4.2, false)	1m 23s
build (3.2.4, gemfiles/Gemfile.elasticsearch-8.x, elasticsearch:8.4.2, 8.4.2, false)	1m 14s
build (2.7.7, gemfiles/Gemfile.opensearch-1.x, opensearch:1.3.3, 1.3.3, true)	1m 24s
build (2.7.7, gemfiles/Gemfile.opensearch-2.x, opensearch:2.0.1, 2.0.1, false)	1m 24s
build (3.2.4, gemfiles/Gemfile.opensearch-2.x, opensearch:2.1.0, 2.1.0, false)	1m 34s
build (3.3.3, gemfiles/Gemfile.opensearch-2.x, opensearch:2.1.0, 2.1.0, false)	1m 16s
	23m 12s

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