Simplify `define_fake_data_batch_for`. #414

Job	Run time
ci-check (run_each_gem_spec, 3.2, elasticsearch:8.16.1)	18m 55s
ci-check (run_each_gem_spec, 3.2, opensearch:2.18.0)	18m 41s
ci-check (run_each_gem_spec, 3.2, opensearch:2.7.0)	18m 26s
ci-check (run_each_gem_spec, 3.3, elasticsearch:8.16.1)	17m 50s
ci-check (run_each_gem_spec, 3.3, opensearch:2.18.0)	18m 21s
ci-check (run_each_gem_spec, 3.3, opensearch:2.7.0)	17m 37s
ci-check (run_each_gem_spec, 3.4, elasticsearch:8.16.1)	18m 57s
ci-check (run_each_gem_spec, 3.4, opensearch:2.18.0)	17m 23s
ci-check (run_each_gem_spec, 3.4, opensearch:2.7.0)	17m 59s
ci-check (run_misc_checks, 3.4, elasticsearch:8.16.1)	7m 26s
ci-check (run_specs_with_vcr, 3.4, elasticsearch:8.16.1)	9m 45s
ci-check (run_specs_file_by_file, 3.4, elasticsearch:8.16.1)	16m 36s
All CI Checks Passed	6s
	3h 18m 2s

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