https://www.elastic.co/guide/en/elasticsearch/reference/5.6/modules-scripting-fields.html 这里说明了script中如何取文档中的值, 但是并没有说明value和values的差别.

没有找到官方的说明, 测了一下, 对于list值, values会返回所有数据, value只返回第一个值. 所以在contains时, 用value可能不会得到正确的结果. 如果不是list, 返回结果都是一样的.

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          "name": "邮轮上所有餐饮都免费吗？",
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POST lesson_v20170823/_search?q=lessonID:44
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