共计 2378 个字符,预计需要花费 6 分钟才能阅读完成。
下面描述一个场景
如果某个字段的类型是 text,在创建索引的时候,针对每个 document,对应的这个 text 字段都会对内容进行分词。由于 ES 不允许对已经存在的 field 的类型进行修改,就会导致该字段一直都是会被分词,那么如果之后有需求想对该字段排序,就不行了。具体看下面展示的示例。
PUT /test_index
{
"mappings": {
"properties": {
"field1": {"type": "text"}
}
}
}
GET /test_index/_search
{
"query": {"match_all": {}
},
"sort": [
{
"field1": {"order": "desc"}
}
]
}
{
"error": {
"root_cause": [
{
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [field1] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "test_index",
"node": "P-b-TEvyQOylMyEcMEhApQ",
"reason": {
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [field1] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
}
}
],
"caused_by": {
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [field1] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.",
"caused_by": {
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [field1] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
}
}
},
"status": 400
}
这个时候要想解决这个问题,就可以将一个 string field 建立两次索引,一个分词用来搜索,一个不分词用来进行排序。
Alternatively use a keyword field instead.
根据错误中的提示,我们重新建立索引
PUT /test_index
{
"mappings": {
"properties": {
"field1": {
"type": "text",
"fields": {
"keyword": {"type": "keyword"}
}
}
}
}
}
GET /test_index/_search
{
"query": {"match_all": {}
},
"sort": [
{
"field1.keyword": {"order": "desc"}
}
]
}
{
"took" : 6,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 3,
"relation" : "eq"
},
"max_score" : null,
"hits" : [
{
"_index" : "test_index",
"_type" : "_doc",
"_id" : "3",
"_score" : null,
"_source" : {"field1" : "third"},
"sort" : ["third"]
},
{
"_index" : "test_index",
"_type" : "_doc",
"_id" : "2",
"_score" : null,
"_source" : {"field1" : "second"},
"sort" : ["second"]
},
{
"_index" : "test_index",
"_type" : "_doc",
"_id" : "1",
"_score" : null,
"_source" : {"field1" : "one"},
"sort" : ["one"]
}
]
}
}
正文完
发表至:无分类
2019-05-01