Searchkick/Elasticsearch - Root映射定义包含不支持的参数

Question

我在Heroku上有一个Rails API，在重新索引一个类时遇到了以下问题。

$ heroku run rake searchkick:reindex CLASS=User

并得到以下错误

Elasticsearch::Transport::Transport::Errors::BadRequest: [400] {"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters: [_default_ : {_routing={}, dynamic_templates=[{string_template={mapping={ignore_above=30000, type=keyword, fields={analyzed={analyzer=searchkick_index, index=true, type=text}}}, match_mapping_type=string, match=*}}], properties={}}]"}],"type":"mapper_parsing_exception","reason":"Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters: [_default_ : {_routing={}, dynamic_templates=[{string_template={mapping={ignore_above=30000, type=keyword, fields={analyzed={analyzer=searchkick_index, index=true, type=text}}}, match_mapping_type=string, match=*}}], properties={}}]","caused_by":{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters: [_default_ : {_routing={}, dynamic_templates=[{string_template={mapping={ignore_above=30000, type=keyword, fields={analyzed={analyzer=searchkick_index, index=true, type=text}}}, match_mapping_type=string, match=*}}], properties={}}]"}},"status":400}

我的User类具有以下内容

class User < ApplicationRecord
    searchkick settings: { 
        number_of_shards: 1,
        number_of_replicas: 1,
        max_ngram_diff: 49,
        max_shingle_diff: 4
        }
end

我添加了max_ngram_diff和max_shingle_diff，因为这解决了另一个问题。但是，我也不确定是否有正确的max_ngram_diff和max_shingle_diff值。

从我的Gemfile.lock

searchkick (2.5.0)
      activemodel (>= 4.1)
      elasticsearch (>= 1)
      hashie

elasticsearch (6.2.0)
      elasticsearch-api (= 6.2.0)
      elasticsearch-transport (= 6.2.0)
    elasticsearch-api (6.2.0)
      multi_json
    elasticsearch-transport (6.2.0)
      faraday
      multi_json

你知道该怎么做吗？

Answer 1

此错误是由于版本与ElasticSearch不兼容造成的。即，最新版本的Searchkick (即v4.1)需要ElasticSearch v7.4.0

我遇到了这个错误，并通过将我的Elasticsearch从7.x降级到6.8.4来解决它。正在运行SearchKick(3.1.2)。

要检查计算机上的ElasticSearch版本，请运行以下命令：

curl -XGET 'localhost:9200'

通过Gemfile检查您的机器上运行的searchkick的版本。在gemfile中，要安装特定版本的ElasticSearch，您需要ElasticSearch v6.2.0，运行以下命令

brew install elasticsearch@6.2.0

重新启动elasticsearch服务！