Having this field in my mapping
"answer": { "type": "text", "fields": { "keyword": { "type": "keyword", "ignore_above": 256 } } },
I try to execute this aggregation
"aggs": { "answer": { "terms": { "field": "answer" } },
but I get this error
"type": "illegal_argument_exception", "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [answer] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."
得到解决
You need to aggregate on the keyword sub-field, like this:
"aggs": { "answer": { "terms": { "field": "answer.keyword" } },
开始在网上查询解决方案时,有的是修改mapping
1.PUT my_index/_mapping/my_type { "properties": { "my_field": { "type": "text", "fielddata": true } } }
或者
2.使用.keyword 推荐
"aggs": {
"answer": {
"terms": {
"field": "answer.keyword"
}
}