Elasticsearch murmur3模板

Question

如何使用murmur3哈希？您能否提供一个样本，并附上每个领域的评论。

我已阅读https://www.elastic.co/guide/en/elasticsearch/plugins/current/mapper-murmur3-usage.html上的文档，他们提供了类似的示例：

PUT my_index
{
     "mappings": { --> what is these?
    "my_type": { --> what is these?
      "properties": { --> what is these?
        "my_field": { --> what is these?
          "type": "keyword", --> what is these?
          "fields": { --> what is these?
            "hash": {
              "type": "murmur3"
            }
          }
        }
      }
    }
  }
}

还请详细说明如何在GET上使用它。