Frozen indices are deprecated which makes all the [SQL features supporting frozen indices](https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-index-frozen.html) obsolete.

This includes:

* `index_include_frozen` request parameter in the `_sql` endpoint
* `index.include.frozen` (J|O)DBC driver settings
* `SHOW TABLES INCLUDE FROZEN` queries and the `FROZEN INDEX` kind in the corresponding response
* The `FROZEN` modifier in `FROM` clauses (as in `SELECT * FROM FROZEN archive`)

`_search` raises a deprecation warning when frozen indices are being searched with `ignore_throttled=false`. SQL could do the same when the `index_include_frozen` request parameter is set or when the `FROZEN` keyword is used.

Relates to https://github.com/elastic/elasticsearch/issues/70192
x-pack/plugin/sql/sql-action/src/main/java/org/elasticsearch/xpack/sql/action/SqlQueryRequest.java
headers,
            null,
            null,
            keepAlive,
            mode(),
            version(),
            columnar()
        );
    }
    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeString(cursor);
        out.writeOptionalBoolean(columnar);
        out.writeBoolean(fieldMultiValueLeniency);
        out.writeBoolean(indexIncludeFrozen);
        out.writeOptionalBoolean(binaryCommunication);
        if (out.getVersion().onOrAfter(Version.V_7_14_0)) {
            out.writeOptionalTimeValue(waitForCompletionTimeout);
            out.writeBoolean(keepOnCompletion);
            out.writeOptionalTimeValue(keepAlive);
        }
    }
    @Override
    public int hashCode() {
        return Objects.hash(
            super.hashCode(),
            cursor,
            columnar,
            fieldMultiValueLeniency,