2021-04-15 23:36:55.681 ERROR 19052 --- [io-12000-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is ElasticsearchStatusException[Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [brandName] in order to load field data by uninverting the inverted index. Note that this can use significant memory.]]; nested: ElasticsearchException[Elasticsearch exception [type=illegal_argument_exception, reason=Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [brandName] in order to load field data by uninverting the inverted index. Note that this can use significant memory.]];] with root cause
org.elasticsearch.ElasticsearchException: Elasticsearch exception [type=illegal_argument_exception, reason=Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [brandName] in order to load field data by uninverting the inverted index. Note that this can use significant memory.]
at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:496) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:407) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:437) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.ElasticsearchException.fromXContent(ElasticsearchException.java:407) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.ElasticsearchException.innerFromXContent(ElasticsearchException.java:437) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.ElasticsearchException.failureFromXContent(ElasticsearchException.java:603) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:169) ~[elasticsearch-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1793) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1770) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1527) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1484) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1454) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:970) ~[elasticsearch-rest-high-level-client-7.6.2.jar:7.6.2]
type=illegal_argument_exception, reason=Text fields are not optimised for operations that require per-document field data like aggregations and sorting
根据错误提示，非法参数异常，该fields默认情况下不允许请求的，请使用一个关键字替换。检查一下。
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