# Fielddata usage problem with \_type field

**URL:** <https://discuss.elastic.co/t/fielddata-usage-problem-with--type-field/64001>\
**Category:** Elasticsearch\
**Created:** [October 26, 2016, 12:30pm UTC](https://discuss.elastic.co/t/fielddata-usage-problem-with--type-field/64001 "2016-10-26T12:30:39Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![itplayer](https://avatars.discourse-cdn.com/v4/letter/i/d26b3c/32.png) [@itplayer](https://discuss.elastic.co/u/itplayer)\
**Post date:** [October 26, 2016, 12:30pm UTC](https://discuss.elastic.co/t/fielddata-usage-problem-with--type-field/64001/1 "2016-10-26T12:30:39Z")

</div>

Hi everyone,  
I'm not fully understand what does this means when I access

The API return

```
    "xyzreport_20161025" : {
        "primaries" : {
            "fielddata" : {
                "memory_size_in_bytes" : 15704336,
                "evictions" : 0,
                "fields" : {
                    "_type" : {
                        "memory_size_in_bytes" : 15704336
                    }
                }
            }
        },
        "total" : {
            "fielddata" : {
                "memory_size_in_bytes" : 15704336,
                "evictions" : 0,
                "fields" : {
                    "_type" : {
                        "memory_size_in_bytes" : 15704336
                    }
                }
            }
        }
    },

```

What is actually \_type field means? I'm sure that my mapping schema does not have this field, is this mean ES internal field?

Why and when ES will use this \_type for fielddata?  
Please share your idea and experience.  
Many thanks

---

<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:** [July 5, 2017, 10:09pm UTC](https://discuss.elastic.co/t/fielddata-usage-problem-with--type-field/64001/2 "2017-07-05T22:09:04Z")

</div>