es - elasticsearch search - missing value and unmapped fields

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

问：missing value和unmapped fields的配置有什么作用？
答：

问：missing和unmapped如何使用？
答：

# sort
# missing value and ignore unmapped fields# unmapped type
DELETE /sort_test_6# 映射
PUT /sort_test_6
{"mappings": {"properties": {"name": {"type": "text"}}}
}# 索引
POST /sort_test_6/_doc/1
{"name": "hello"
}# 搜索 - 没有age的map映射，报错
GET /sort_test_6/_search
{"query": {"match_all": {}},"sort": ["age"]
}# 结果
{"error" : {"root_cause" : [{"type" : "query_shard_exception","reason" : "No mapping found for [age] in order to sort on","index_uuid" : "5UvUVsd7Q7uxocP1OGeuvw","index" : "sort_test_6"}],"type" : "search_phase_execution_exception","reason" : "all shards failed","phase" : "query","grouped" : true,"failed_shards" : [{"shard" : 0,"index" : "sort_test_6","node" : "VK0GF1KyQGKmM_0KvgHHnw","reason" : {"type" : "query_shard_exception","reason" : "No mapping found for [age] in order to sort on","index_uuid" : "5UvUVsd7Q7uxocP1OGeuvw","index" : "sort_test_6"}}]},"status" : 400
}# 搜索 - 没有age的map映射，默认long
GET /sort_test_6/_search
{"query": {"match_all": {}},"sort": [{"age": {"unmapped_type": "long"}}]
}# 结果
{"took" : 10,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 1,"relation" : "eq"},"max_score" : null,"hits" : [{"_index" : "sort_test_6","_type" : "_doc","_id" : "1","_score" : null,"_source" : {"name" : "hello"},"sort" : [9223372036854775807]}]}
}# missing value
PUT /sort_test_7
{"mappings": {"properties": {"age": {"type": "long"}}}
}# 索引
PUT /sort_test_7/_doc/1
{"age": 18
}# 索引
PUT /sort_test_7/_doc/2
{"age": 19
}# 索引
PUT /sort_test_7/_doc/3
{"name": "good"
}# 搜索 - 如果文档没有字段值，missing可以指定
# 没有字段的文档在排序时是处在最上（_first）
# 或最下（_last）的位置
GET /sort_test_7/_search
{"query": {"match_all": {}},"sort": [{"age": {"order"  : "desc","missing": "_first"}}]
}# 结果
{"took" : 0,"timed_out" : false,"_shards" : {"total" : 1,"successful" : 1,"skipped" : 0,"failed" : 0},"hits" : {"total" : {"value" : 3,"relation" : "eq"},"max_score" : null,"hits" : [{"_index" : "sort_test_7","_type" : "_doc","_id" : "3","_score" : null,"_source" : {"name" : "good"},"sort" : [9223372036854775807]},{"_index" : "sort_test_7","_type" : "_doc","_id" : "2","_score" : null,"_source" : {"age" : 19},"sort" : [19]},{"_index" : "sort_test_7","_type" : "_doc","_id" : "1","_score" : null,"_source" : {"age" : 18},"sort" : [18]}]}
}

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