How to judge the default version of kafka used by filebeat7.17.9

[fw0037]

I found such description in file https://github.com/elastic/beats/blob/v7.17.9/libbeat/common/kafka/version.go ： // Version is a kafka version type Version string var ( // Sarama expects version strings to be fully expanded, e.g. "1.1.1". // We also allow versions to be specified as a prefix, e.g. "1", // understood as referencing the most recent version starting with "1". // truncatedKafkaVersions stores a lookup of the abbreviations we accept. truncatedKafkaVersions = map[string]sarama.KafkaVersion{ "0.8.2": sarama.V0_8_2_2, "0.8": sarama.V0_8_2_2,

    "0.9.0": sarama.V0_9_0_1,
    "0.9":   sarama.V0_9_0_1,

    "0.10.0": sarama.V0_10_0_1,
    "0.10.1": sarama.V0_10_1_0,
    "0.10.2": sarama.V0_10_2_1,
    "0.10":   sarama.V0_10_2_1,

    "0.11.0": sarama.V0_11_0_2,
    "0.11":   sarama.V0_11_0_2,

    "1.0": sarama.V1_0_0_0,
    "1.1": sarama.V1_1_1_0,
    "1":   sarama.V1_1_1_0,

    "2.0": sarama.V2_0_1_0,
    "2.1": sarama.V2_1_0_0,
    "2.2": sarama.V2_2_0_0,
    "2.3": sarama.V2_3_0_0,
    "2.4": sarama.V2_4_0_0,
    "2.5": sarama.V2_5_0_0,
    "2.6": sarama.V2_6_0_0,
    "2":   sarama.V2_6_0_0,
}

)

Now the question is how to judge which version of Kafka filebeat7.17.9 really corresponds to? kafka version 2.6 ， or others?

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