thanks Ivan,
after adding the id:
curl -XGET 'localhost:9200/question_bank/questions/0/_explain' -d '{
"query" : {"query_string" : {
"query" : "a b c d"
}}}'
I got this:
{"ok":false,"_index":"question_bank","_type":"questions","_id":"0","matched":false}
I also tried search with explain option, like this:
curl -XGET 'localhost:9200/question_bank/questions/_search' -d '{
"query" : {"query_string" : {
"query" : "a b c d"
}},"explain":true}'
and I got:
{"took":234,"timed_out":false,"_shards":{"total":2,"successful":2,"failed":0},"hits":{"total":1324189,"max_score":13.550743,"hits":[{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"EEtIn8qkRKulaILawxLyVw","_score":13.550743,
"_source" : {"id":3413350,"stem_inner":" 设集合A={a，b}，B={b，c，d}，则A∪B=（ ）
A、{b}B、{b，c，d}C、{a，c，d}D、{a，b，c，d}"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"Ua4UHbN_R7C4rb3m57c4OQ","_score":12.746416,
"_source" :
{"id":2496941,"stem_inner":"8.已知集合A={a，b}，B={a，b，c}，C={b，c，d}，那么集合(A∩B)∪C等于A{a，b，c}B{a，b，d}C{b，c，d}D{a，b，c，d}"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"YiqnTpRHTTKdmrMYsG0Lsg","_score":12.746416,
"_source" : {"id":3410906,"stem_inner":"
已知集合A={a，b}，B={a，b，c}，C={b，c，d}，那么集合（A∩B）∪C等于（ ）
A、{a，b，c}B、{a，b，d}C、{b，c，d}D、{a，b，c，d}"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"TIdSFa8hQ0-wkgOZZA7reA","_score":12.324519,
"_source" : {"id":348640,"stem_inner":"设集合A={a，b}，B={b，c，d}，则A∪B= [
]A．{b} B．{b，c，d} C．{a，c，d} D．{a，b，c，d}
"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":1,"_node":"4ZIK6-O-SvyD4BSNYrZL0g","_index":"question_bank","_type":"questions","_id":"BMlUOGJ9T1egOdR2IgpOOA","_score":12.191338,
"_source" : {"id":326247,"stem_inner":"设，，，则[ ]A、a＜b＜c B、c＜b＜a C、c＜a＜b
D、b＜a＜c "},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"tZyT7YLXQNS3b8CT9cqm_A","_score":12.18048,
"_source" : {"id":484715,"stem_inner":"设，，，则[ ]A、a＜b＜c B、c＜b＜a C、c＜a＜b
D、b＜a＜c "},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"5ReZjgkDR4y6pEirHwLQsQ","_score":12.18048,
"_source" : {"id":486184,"stem_inner":"若，则 [ ]A、a＜b＜c B、c＜b＜a C、c＜a＜b
D、b＜a＜c "},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":1,"_node":"4ZIK6-O-SvyD4BSNYrZL0g","_index":"question_bank","_type":"questions","_id":"fWcTQJelRpqHOKeDiwITDg","_score":12.084454,
"_source" : {"id":321858,"stem_inner":"若a=-0.42，b=-4-2，c=，则a、b、c、d的大小关系为[
]A、a＜b＜c＜d B、b＜a＜d＜c C、a＜d＜c＜b D、c＜a＜d＜b
"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":1,"_node":"4ZIK6-O-SvyD4BSNYrZL0g","_index":"question_bank","_type":"questions","_id":"u5egHX5FRVKPfeWHzNduxQ","_score":11.856148,
"_source" : {"id":3522849,"stem_inner":"图中A,B,C,D四地，属于背斜构造的是（ ）A、A
B、B C、C
D、D"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}},{"_shard":0,"_node":"m-zznkETTn2Z5mSrCF4DzA","_index":"question_bank","_type":"questions","_id":"Gqj4krlpSfyG2T2Jqw1R7A","_score":11.841712,
"_source" :
{"id":2691009,"stem_inner":"已知集合A={a，b}，B={a，b，c}，C={b，c，d}，那么集合（A∩B）∪C等于（
）A．{a，b，c}B．{a，b，d}C．{b，c，d}D．{a，b，c，d}"},"_explanation":{"value":0.0,"description":"product
of:","details":[{"value":0.0,"description":"sum
of:"},{"value":0.0,"description":"coord(0/4)"}]}}]}}
在 2013年11月14日星期四UTC+8下午2时25分48秒，Ivan Brusic写道：
The proper syntax is /{index}/{type}/{id}/_explain
You need to add the id of the document to the API call.
https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/rest/action/explain/RestExplainAction.java?source=cc#L58-59
--
Ivan
On Wed, Nov 13, 2013 at 8:54 PM, <puyu...@gmail.com <javascript:>> wrote:
Hi all,
I'm a newbie to es, and I've got a problem when using _explain api,
this is the command I use:
curl -XGET 'localhost:9200/question_bank/questions/_explain' -d '{
"query" : {"query_string" : {
"query" : "a b c d"
}}}'
and got this result:
{"_index":"question_bank","_type":"questions","_id":"_explain","exists":false}
Thanks so much for any help:)
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