TechOverflow Logo
TechOverflow

如何修复 ElasticSearch 'Fielddata is disabled on text fields by default' 对于 keyword 字段

English Deutsch 简体中文

问题：

你在 ElasticSearch 中有一个名为例如 patterns 的 keyword 类型字段。但是，当你查询此字段的聚合时，例如

es_fielddata_example.py
es.search(index="strings", body={
    "size": 0,
    "aggs" : {
        "patterns" : {
            "terms" : { "field" : "pattern" }
        }
    }
})

你看到此错误消息：

es_fielddata_error.txt
elasticsearch.exceptions.RequestError: RequestError(400, 'search_phase_execution_exception', 'Fielddata is disabled on text fields by default. Set fielddata=true on [pattern] 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.'

解决方案

此错误消息令人困惑，因为你已经有 keyword 字段。但是，ElasticSearch fielddata 文档告诉我们你需要在查询中使用 pattern.keyword 而不是仅使用 pattern。

完整示例：

es_fielddata_fix.py
es.search(index="strings", body={
    "size": 0,
    "aggs" : {
        "patterns" : {
            "terms" : { "field" : "pattern.keyword" }
        }
    }
})
Check out similar posts by category: Databases, ElasticSearch