# Logstash output Elasticsearch MapperParsingException\[Field name \[classes.loaded\] cannot contain '.'\]

**URL:** <https://discuss.elastic.co/t/logstash-output-elasticsearch-mapperparsingexception-field-name-classes-loaded-cannot-contain/68086>\
**Category:** Logstash\
**Created:** [December 5, 2016, 6:28pm UTC](https://discuss.elastic.co/t/logstash-output-elasticsearch-mapperparsingexception-field-name-classes-loaded-cannot-contain/68086 "2016-12-05T18:28:20Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![gearoid](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/gearoid/32/13572_2.png) [@gearoid](https://discuss.elastic.co/u/gearoid)\
**Post date:** [December 5, 2016, 6:28pm UTC](https://discuss.elastic.co/t/logstash-output-elasticsearch-mapperparsingexception-field-name-classes-loaded-cannot-contain/68086/1 "2016-12-05T18:28:20Z")

</div>

Hi

I am running the latest version of Logstash [5.02] Elasticsearch [5.0.2] and Kibana [5.0.2], I'm using the [`http_poller` plugin](https://www.elastic.co/guide/en/logstash/current/plugins-inputs-http_poller.html) in Logstash, nstalled it and got confirmation. I am trying to get spring actuator (metrics) from my webapp and index them into Elasticsearch. it works OK for health checks but when I try to get the metrics I get this error from elasticsearch.

```
MapperParsingException[Field name [classes.loaded] cannot contain '.']
        at org.elasticsearch.index.mapper.object.ObjectMapper$TypeParser.parseProperties(ObjectMapper.java:283)
        at org.elasticsearch.index.mapper.object.ObjectMapper$TypeParser.parseObjectOrDocumentTypeProperties(ObjectMapper.java:228)
        at org.elasticsearch.index.mapper.object.RootObjectMapper$TypeParser.parse(RootObjectMapper.java:137)
        at org.elasticsearch.index.mapper.DocumentMapperParser.parse(DocumentMapperParser.java:211)
        at org.elasticsearch.index.mapper.DocumentMapperParser.parseCompressed(DocumentMapperParser.java:192)
        at org.elasticsearch.index.mapper.MapperService.parse(MapperService.java:368)
        at org.elasticsearch.cluster.metadata.MetaDataMappingService$2.execute(MetaDataMappingService.java:382)
        at org.elasticsearch.cluster.service.InternalClusterService$UpdateTask.run(InternalClusterService.java:388)
        at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:225)
        at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:188)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

```

when I run logstash `"type"=>"mapper_parsing_exception", "reason"=>"Field name [classes.loaded] cannot contain '.'"` I get this error message after it shows the metric in json format.

```
{
                            "heap.committed" => 475136,
                            "threads.daemon" => 61,
                               "counter.mem" => 0,
                  "counter.classes.unloaded" => 0,
                "counter.systemload.average" => 0,
                                   "classes" => 14104,
                      "http_poller_metadata" => {
                 "request" => {
            "headers" => {
                "Accept" => "application/json"
            },
             "method" => "get",
               "auth" => {
                "pass" => "tester",
                "user" => "tester"
            },
                "url" => "http://localhost:8080/myappapi/details/metrics"
        },
        "response_headers" => {
                                 "date" => "Mon, 05 Dec 2016 12:15:11 GMT",
                               "server" => "Apache-Coyote/1.1",
                              "expires" => "0",
                    "transfer-encoding" => "chunked",
               "x-content-type-options" => "nosniff",
                     "x-xss-protection" => "1; mode=block",
                      "x-frame-options" => "DENY",
                         "content-type" => "application/json;charset=UTF-8",
                        "cache-control" => "no-cache, no-store, max-age=0, must-revalidate",
                "x-application-context" => "application:dev:8080",
                               "pragma" => "no-cache",
            "strict-transport-security" => "max-age=31536000 ; includeSubDomains"
        },
                    "code" => 200,
        "response_message" => "OK",
           "times_retried" => 0,
         "runtime_seconds" => 0.371,
                    "name" => "consumersmetrics",
                    "host" => "gman"
    },
                        "systemload.average" => -1.0,
        "counter.status.200.details.metrics" => 4,
                          "counter.mem.free" => 0,
}
12:15:12.725 [[main]>worker0] WARN logstash.outputs.elasticsearch - Failed action. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"logstash-2016.12.05", :_type=>"myappapi_health_details", :_routing=>nil}, 2016-12-05T12:15:11.919Z %{host} %{message}], :response=>{"create"=>{"_index"=>"logstash-2016.12.05", "_type"=>"myappapi_health_details", "_id"=>"AVjO6MtNqsQV7YsrAn8i", "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"Field name [classes.loaded] cannot contain '.'"}}}}

```

Anyone know why..

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [December 5, 2016, 9:08pm UTC](https://discuss.elastic.co/t/logstash-output-elasticsearch-mapperparsingexception-field-name-classes-loaded-cannot-contain/68086/2 "2016-12-05T21:08:47Z")

</div>

Are you sure you're running ES 5.x and not 2.x? ES 5.0 should accept field names with periods, see [https://www.elastic.co/guide/en/elasticsearch/reference/2.4/dots-in-names.html](https://www.elastic.co/guide/en/elasticsearch/reference/2.4/dots-in-names.html). See also Logstash's de\_dot filter.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 2, 2017, 9:08pm UTC](https://discuss.elastic.co/t/logstash-output-elasticsearch-mapperparsingexception-field-name-classes-loaded-cannot-contain/68086/3 "2017-01-02T21:08:54Z")

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