# Cannot read field \\"outputs\\" because \\"this.fst\\" is null

**URL:** <https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060>\
**Category:** Elasticsearch\
**Created:** [March 12, 2021, 9:03am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060 "2021-03-12T09:03:39Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![yeziblo](https://avatars.discourse-cdn.com/v4/letter/y/74df32/32.png) [@yeziblo](https://discuss.elastic.co/u/yeziblo)\
**Post date:** [March 12, 2021, 9:03am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/1 "2021-03-12T09:03:39Z")

</div>

Hi everyone.

I've got a very strange problem:

when I used dsl like:

```auto
GET index/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match_phrase": {
          "name": "some words here"
          }
        }
      ]
    }
  }
}

```

And I got a error:

```auto
{
  "error": {
    "root_cause": [
      {
        "type": "query_shard_exception",
        "reason": "failed to create query: Cannot read field \"outputs\" because \"this.fst\" is null",
        "index_uuid": "0MODiL1YQmqb-LUncJAjbg",
        "index": "my index"
      }
    ],
    "type": "search_phase_execution_exception",
    "reason": "all shards failed",
    "phase": "query",
    "grouped": true,
    "failed_shards": [
      {
        "shard": 0,
        "index": "my index",
        "node": "aTr2L6I-T7SomLXkAzHZyA",
        "reason": {
          "type": "query_shard_exception",
          "reason": "failed to create query: Cannot read field \"outputs\" because \"this.fst\" is null",
          "index_uuid": "0MODiL1YQmqb-LUncJAjbg",
          "index": "my index",
          "caused_by": {
            "type": "null_pointer_exception",
            "reason": "Cannot read field \"outputs\" because \"this.fst\" is null"
          }
        }
      }
    ]
  },
  "status": 400
}

```

Strangest of all, this error doesn't always come up.

Do you have any solutions?

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [March 12, 2021, 9:20am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/2 "2021-03-12T09:20:48Z")

</div>

I have the feeling that one of the shards is corrupted or that there's a bug somewhere.

- Could you tell which exact version you are using?
- Is that something you can reproduce from scratch?
- Is that in production or in dev?
- Did you touch manually by any chance the `data` dir?

---

<div class="post-metadata">

**Author:** ![yeziblo](https://avatars.discourse-cdn.com/v4/letter/y/74df32/32.png) [@yeziblo](https://discuss.elastic.co/u/yeziblo)\
**Post date:** [March 12, 2021, 9:40am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/3 "2021-03-12T09:40:24Z")

</div>

My ES version is 7.9.

I do migrate the data directory manually, and that may be the cause of the problem?

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [March 12, 2021, 10:34am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/4 "2021-03-12T10:34:13Z")

</div>

What do you mean by "do migrate"? What did you do exactly?

---

<div class="post-metadata">

**Author:** ![yeziblo](https://avatars.discourse-cdn.com/v4/letter/y/74df32/32.png) [@yeziblo](https://discuss.elastic.co/u/yeziblo)\
**Post date:** [March 29, 2021, 8:57am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/5 "2021-03-29T08:57:03Z")

</div>

I moved the data dir, and that's why I got a error.  
Thank you for your answer 😉

---

<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [March 29, 2021, 9:51am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/6 "2021-03-29T09:51:56Z")

</div>

So it's fixed now?

---

<div class="post-metadata">

**Author:** ![yeziblo](https://avatars.discourse-cdn.com/v4/letter/y/74df32/32.png) [@yeziblo](https://discuss.elastic.co/u/yeziblo)\
**Post date:** [March 29, 2021, 10:08am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/7 "2021-03-29T10:08:02Z")

</div>

Yes, it's fixed.

---

<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:** [April 26, 2021, 10:08am UTC](https://discuss.elastic.co/t/cannot-read-field-outputs-because-this-fst-is-null/267060/8 "2021-04-26T10:08:46Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.