# No handler for type \[string\] declared on field \[name\]

**URL:** <https://discuss.elastic.co/t/no-handler-for-type-string-declared-on-field-name/248661>\
**Category:** Elasticsearch\
**Created:** [September 15, 2020, 11:01am UTC](https://discuss.elastic.co/t/no-handler-for-type-string-declared-on-field-name/248661 "2020-09-15T11:01:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![shwesinhan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shwesinhan/32/78663_2.png) [@shwesinhan](https://discuss.elastic.co/u/shwesinhan)\
**Post date:** [September 15, 2020, 11:01am UTC](https://discuss.elastic.co/t/no-handler-for-type-string-declared-on-field-name/248661/1 "2020-09-15T11:01:19Z")

</div>

Hi community.

We have one issue after rolling upgrade from version 5.x to version 6.x.  
The issue is happening when reindex. Please check this out below:

```auto
     {
       "took": 22,
       "timed_out": false,
       "total": 205,
       "updated": 0,
       "created": 0,
       "deleted": 0,
       "batches": 1,
       "version_conflicts": 0,
       "noops": 0,
       "retries": {
         "bulk": 0,
         "search": 0
       },
       "throttled_millis": 0,
       "requests_per_second": -1,
       "throttled_until_millis": 0,
       "failures": [
         {
           "index": "logstash-dev-2020.09",
           "type": "logevent",
           "id": "AXROtw0f8TodnXvQuCn4",
           "cause": {
             "type": "mapper_parsing_exception",
             "reason": "Failed to parse mapping [_default_]: No handler for type [string] declared on field [@version]",
             "caused_by": {
               "type": "mapper_parsing_exception",
               "reason": "No handler for type [string] declared on field [@version]"
             }
           },
           "status": 400
         },
     .
     .
     .
         {
           "index": "logstash-dev-2020.09",
           "type": "logevent",
           "id": "AXRzHrS2AW9Oz8lG34J2",
           "cause": {
             "type": "mapper_parsing_exception",
             "reason": "Failed to parse mapping [_default_]: No handler for type [string] declared on field [@version]",
             "caused_by": {
               "type": "mapper_parsing_exception",
               "reason": "No handler for type [string] declared on field [@version]"
             }
           },
           "status": 400
         }
       ]
     } 

```

Is there anyway to solve above issue?  
Thanks in advance.

---

<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:** [October 13, 2020, 11:01am UTC](https://discuss.elastic.co/t/no-handler-for-type-string-declared-on-field-name/248661/2 "2020-10-13T11:01:22Z")

</div>

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