Put mapping results in 400

[R0boC0p]

Elastic.Clients.Elasticsearch version: Elastic.Clients.Elasticsearch 8.11.0

Elasticsearch version: 8.11.1

.NET runtime version: 8.0.100

Operating system version: Windows 10

Description of the problem including expected versus actual behavior:
I am trying to update a dynamic template using the elastic-search-client in version 8 and being provided with a 400 error. Setting the same dynamic-template via the create index works flawlessly.

Steps to reproduce:

 var response = await _client.Indices.PutMappingAsync<DocumentT>(index, c => c
     .DynamicTemplates(new List<IDictionary<string, DynamicTemplate>>
     {
         new Dictionary<string, DynamicTemplate>
         {
             { "my-template", new DynamicTemplate
                 {
                     MatchMappingType = "string",
                     Mapping = new TextProperty
                     {
                         Analyzer = "iq_text_base",
                         Fields = new Properties
                         {
                             {
                                 "date", new DateProperty
                                 {
                                     Format = "strict_date_time||strict_date",
                                     IgnoreMalformed = true
                                 }
                             }
                         },
                         IndexOptions = IndexOptions.Freqs,
                     }
                 }
             }
         }
     }), ct);

Expected behavior
The client should send the request in an acceptable format.

**Provide DebugInformation **:

Invalid Elasticsearch response built from a unsuccessful (400) low level call on PUT: /search-sportworld-events/_mapping?pretty=true&error_trace=true
 Exception: Request failed to execute. Call: Status code 400 from: PUT /search-sportworld-events/_mapping?pretty=true&error_trace=true. ServerError: Type: mapper_parsing_exception Reason: "Failed to parse mapping: Dynamic template syntax error. An array of named objects is expected." CausedBy: "Type: mapper_parsing_exception Reason: "Dynamic template syntax error. An array of named objects is expected.""

# Audit trail of this API call:
 - [1] BadResponse: Node: https://b1-sportworld-dev-eu-central-1.es.eu-central-1.aws.cloud.es.io/ Took: 00:00:00.0682161
# OriginalException: Elastic.Transport.TransportException: Request failed to execute. Call: Status code 400 from: PUT /search-sportworld-events/_mapping?pretty=true&error_trace=true. ServerError: Type: mapper_parsing_exception Reason: "Failed to parse mapping: Dynamic template syntax error. An array of named objects is expected." CausedBy: "Type: mapper_parsing_exception Reason: "Dynamic template syntax error. An array of named objects is expected.""
# Request:
{
  "dynamic_templates": {
    "my-template": {
      "mapping": {
        "analyzer": "iq_text_base",
        "fields": {
          "date": {
            "format": "strict_date_time||strict_date",
            "ignore_malformed": true,
            "type": "date"
          }
        },
        "index_options": "freqs",
        "type": "text"
      },
      "match_mapping_type": "string"
    }
  }
}
# Response:
{
  "error" : {
    "root_cause" : [
      {
        "type" : "mapper_parsing_exception",
        "reason" : "Dynamic template syntax error. An array of named objects is expected.",
        "stack_trace" : "org.elasticsearch.index.mapper.MapperParsingException: Dynamic template syntax error. An array of named objects is expected.\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.processField(RootObjectMapper.java:455)\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.parse(RootObjectMapper.java:412)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:116)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:83)\n\tat [email protected]/org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:538)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.applyRequest(MetadataMappingService.java:150)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.execute(MetadataMappingService.java:115)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.innerExecuteTasks(MasterService.java:1039)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeTasks(MasterService.java:1004)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeAndPublishBatch(MasterService.java:232)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.lambda$run$2(MasterService.java:1626)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.run(MasterService.java:1623)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.lambda$doRun$0(MasterService.java:1237)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.doRun(MasterService.java:1216)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)\n\tat java.base/java.lang.Thread.run(Thread.java:1583)\n"
      }
    ],
    "type" : "mapper_parsing_exception",
    "reason" : "Failed to parse mapping: Dynamic template syntax error. An array of named objects is expected.",
    "caused_by" : {
      "type" : "mapper_parsing_exception",
      "reason" : "Dynamic template syntax error. An array of named objects is expected.",
      "stack_trace" : "org.elasticsearch.index.mapper.MapperParsingException: Dynamic template syntax error. An array of named objects is expected.\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.processField(RootObjectMapper.java:455)\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.parse(RootObjectMapper.java:412)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:116)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:83)\n\tat [email protected]/org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:538)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.applyRequest(MetadataMappingService.java:150)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.execute(MetadataMappingService.java:115)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.innerExecuteTasks(MasterService.java:1039)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeTasks(MasterService.java:1004)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeAndPublishBatch(MasterService.java:232)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.lambda$run$2(MasterService.java:1626)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.run(MasterService.java:1623)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.lambda$doRun$0(MasterService.java:1237)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.doRun(MasterService.java:1216)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)\n\tat java.base/java.lang.Thread.run(Thread.java:1583)\n"
    },
    "stack_trace" : "org.elasticsearch.index.mapper.MapperParsingException: Failed to parse mapping: Dynamic template syntax error. An array of named objects is expected.\n\tat [email protected]/org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:540)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.applyRequest(MetadataMappingService.java:150)\n\tat [email protected]/org.elasticsearch.cluster.metadata.MetadataMappingService$PutMappingExecutor.execute(MetadataMappingService.java:115)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.innerExecuteTasks(MasterService.java:1039)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeTasks(MasterService.java:1004)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService.executeAndPublishBatch(MasterService.java:232)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.lambda$run$2(MasterService.java:1626)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$BatchingTaskQueue$Processor.run(MasterService.java:1623)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.lambda$doRun$0(MasterService.java:1237)\n\tat [email protected]/org.elasticsearch.action.ActionListener.run(ActionListener.java:368)\n\tat [email protected]/org.elasticsearch.cluster.service.MasterService$5.doRun(MasterService.java:1216)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:983)\n\tat [email protected]/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)\n\tat java.base/java.lang.Thread.run(Thread.java:1583)\nCaused by: org.elasticsearch.index.mapper.MapperParsingException: Dynamic template syntax error. An array of named objects is expected.\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.processField(RootObjectMapper.java:455)\n\tat [email protected]/org.elasticsearch.index.mapper.RootObjectMapper.parse(RootObjectMapper.java:412)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:116)\n\tat [email protected]/org.elasticsearch.index.mapper.MappingParser.parse(MappingParser.java:83)\n\tat [email protected]/org.elasticsearch.index.mapper.MapperService.parseMapping(MapperService.java:538)\n\t... 16 more\n"
  },
  "status" : 400
}

# TCP states:
  Established: 137
  TimeWait: 30
  CloseWait: 1

# ThreadPool statistics:
  Worker: 
    Busy: 1
    Free: 32766
    Min: 16
    Max: 32767
  IOCP: 
    Busy: 0
    Free: 1000
    Min: 1
    Max: 1000

[flobernd]

Hi @R0boC0p, thanks for reporting!

This is probably a specification issue where a property is incorrectly typed as "single or many" instead of just "array".

[giannik]

any update on a fix for this?

[yansklyarenko]

I've also encountered this issue. Here is the workaround.

[flobernd]

Duplicate of #7968