```
{

  "index_patterns": [

    "filebeat-6.1.0-*"

  ],

  "mappings": {

    "doc": {
```

You seem to have `doc` set as type in your index template. You can see this described better in [the docs](https://www.elastic.co/guide/en/elasticsearch/reference/6.1/indices-templates.html).

---
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