# SQL query cannot extract SQL indices

**URL:** <https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192>\
**Category:** Elasticsearch\
**Tags:** elastic-stack-sql, docker\
**Created:** [July 8, 2021, 1:58pm UTC](https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192 "2021-07-08T13:58:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![olliegator](https://avatars.discourse-cdn.com/v4/letter/o/6f9a4e/32.png) [@olliegator](https://discuss.elastic.co/u/olliegator)\
**Post date:** [July 8, 2021, 1:58pm UTC](https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192/1 "2021-07-08T13:58:55Z")

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Hi,

I am trying to perform a simple query using the Elasticsearch query API in Elasticsearch 7.7.0:

POST /\_sql?format=txt

```auto
{
    "query": "SELECT my_field FROM my_index"
}

```

I am getting the following error:

```auto
{
    "error": {
        "root_cause": [
            {
                "type": "request_seems_to_be_invalid",
                "reason": "Request 'GenericClassTag' cannot be handled; [msg: Cannot extract SQL indices from org.elasticsearch.xpack.sql.action.SqlQueryRequest]"
            }
        ],
        "type": "request_seems_to_be_invalid",
        "reason": "Request 'GenericClassTag' cannot be handled; [msg: Cannot extract SQL indices from org.elasticsearch.xpack.sql.action.SqlQueryRequest]"
    },
    "status": 500
}

```

I tried the same query using a docker container and it worked. Maybe I have some misconfiguration in my Elasticsearch cluster.  
Does anyone have any hints on how to solve this?

Best regards,  
Miguel

---

<div class="post-metadata">

**Author:** ![bogdan.pintea](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bogdan.pintea/32/45740_2.png) [@bogdan.pintea](https://discuss.elastic.co/u/bogdan.pintea)\
**Post date:** [July 12, 2021, 8:44pm UTC](https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192/2 "2021-07-12T20:44:26Z")

</div>

Those messages look very atypical for Elasticsearch/SQL, I'd say even Elasticsearch (`request_seems_to_be_invalid`??). Has there been an additional plugin installed, possibly? Or a proxy reinterpreting the replies?

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<div class="post-metadata">

**Author:** ![olliegator](https://avatars.discourse-cdn.com/v4/letter/o/6f9a4e/32.png) [@olliegator](https://discuss.elastic.co/u/olliegator)\
**Post date:** [July 13, 2021, 1:03pm UTC](https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192/3 "2021-07-13T13:03:50Z")

</div>

I will try to check with our cluster admins.  
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:** [August 10, 2021, 1:04pm UTC](https://discuss.elastic.co/t/sql-query-cannot-extract-sql-indices/278192/4 "2021-08-10T13:04:47Z")

</div>

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