ES：对每一个文档，会取得其所有域的所有值，生成一个名为“_all”的域；执行查询时，如果在query_string未指定查询的域，则在_all域上执行查询操作；

GET /_search?q=’Xianglong’
GET /_search?q=’Xianglong%20Shiba%20Zhang’
GET /_search?q=courses:’Xianglong%20Shiba%20Zhang’
GET /_search?q=courses:’Xianglong’

# curl -H “content-type: application/json” -XGET ‘node1:9200/students1/class1,class2/_search?q=”huang”&pretty’
{
“took” : 14,
“timed_out” : false,
“_shards” : {
“total” : 5,
“successful” : 5,
“skipped” : 0,
“failed” : 0
},
“hits” : {
“total” : 2,
“max_score” : 0.2876821,
“hits” : [
{
“_index” : “students1”,
“_type” : “class2”,
“_id” : “2”,
“_score” : 0.2876821,
“_source” : {
“name” : “Huang yaoshi”,
“gender” : “Female”,
“age” : 48,
“class” : “Taohuadao”
}
},
{
“_index” : “students1”,
“_type” : “class2”,
“_id” : “1”,
“_score” : 0.2876821,
“_source” : {
“name” : “huang rong”,
“gender” : “Male”,
“age” : 23,
“class” : “Gumu Pai”
}
}
]
}
}
# curl -H “content-type: application/json” -XGET ‘node1:9200/students1/class1,class2/_search?q=”huang%20yaoshi”&pretty’
{
“took” : 27,
“timed_out” : false,
“_shards” : {
“total” : 5,
“successful” : 5,
“skipped” : 0,
“failed” : 0
},
“hits” : {
“total” : 1,
“max_score” : 0.5753642,
“hits” : [
{
“_index” : “students1”,
“_type” : “class2”,
“_id” : “2”,
“_score” : 0.5753642,
“_source” : {
“name” : “Huang yaoshi”,
“gender” : “Female”,
“age” : 48,
“class” : “Taohuadao”
}
}
]
}
}
# curl -H “content-type: application/json” -XGET ‘node1:9200/students1/class1,class2/_search?q=class:”huang”&pretty’
{
“took” : 22,
“timed_out” : false,
“_shards” : {
“total” : 5,
“successful” : 5,
“skipped” : 0,
“failed” : 0
},
“hits” : {
“total” : 1,
“max_score” : 0.2876821,
“hits” : [
{
“_index” : “students1”,
“_type” : “class2”,
“_id” : “3”,
“_score” : 0.2876821,
“_source” : {
“name” : “Guo xiang”,
“gender” : “Female”,
“age” : 20,
“class” : “Huang Bang”
}
}
]
}
}

# curl -H “content-type: application/json” -XGET ‘node1:9200/students1/class1,class2/_search?q=class:”Huang%20bang”&pretty’
{
“took” : 22,
“timed_out” : false,
“_shards” : {
“total” : 5,
“successful” : 5,
“skipped” : 0,
“failed” : 0
},
“hits” : {
“total” : 1,
“max_score” : 0.5753642,
“hits” : [
{
“_index” : “students1”,
“_type” : “class2”,
“_id” : “3”,
“_score” : 0.5753642,
“_source” : {
“name” : “Guo xiang”,
“gender” : “Female”,
“age” : 20,
“class” : “Huang Bang”
}
}
]
}
}
前两个：表示在_all域搜索；
后两个：在指定的域上搜索；