[9.2] [ML] Disable ES|QL field stats for TS command (#247641) (#248343)

# Backport

This will backport the following commits from `main` to `9.2`:
- [[ML] Disable ES|QL field stats for TS command
(#247641)](#247641)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Quynh Nguyen
(Quinn)","email":"43350163+qn895@users.noreply.github.com"},"sourceCommit":{"committedDate":"2026-01-08T18:16:45Z","message":"[ML]
Disable ES|QL field stats for TS command (#247641)\n\n## Summary\n\nThis
PR disables ES|QL field stats for TS command\n\n<img width=\"1675\"
height=\"649\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/ea0ffa24-4dc6-434e-a86b-f2237285f8e3\"\n/>\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
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updated or added to match the most common scenarios\n- [ ] If a plugin
configuration key changed, check if it needs to be\nallowlisted in the
cloud and added to the
[docker\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\n-
[ ] This was checked for breaking HTTP API changes, and any
breaking\nchanges have been approved by the breaking-change committee.
The\n`release_note:breaking` label should be applied in these
situations.\n- [ ] [Flaky
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the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
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apply applicable `backport:*` labels.\n\n### Identify risks\n\nDoes this
PR introduce any risks? For example, consider risks like hard\nto test
bugs, performance regression, potential of data loss.\n\nDescribe the
risk, its severity, and mitigation for each identified\nrisk. Invite
stakeholders and evaluate how to proceed before merging.\n\n- [ ] [See
some
risk\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)\n-
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Disable ES|QL field stats for TS
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Disable ES|QL field stats for TS command (#247641)\n\n## Summary\n\nThis
PR disables ES|QL field stats for TS command\n\n<img width=\"1675\"
height=\"649\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/ea0ffa24-4dc6-434e-a86b-f2237285f8e3\"\n/>\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[
]\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\nwas
added for features that require explanation or tutorials\n- [ ] [Unit or
functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [ ] If a plugin
configuration key changed, check if it needs to be\nallowlisted in the
cloud and added to the
[docker\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\n-
[ ] This was checked for breaking HTTP API changes, and any
breaking\nchanges have been approved by the breaking-change committee.
The\n`release_note:breaking` label should be applied in these
situations.\n- [ ] [Flaky
Test\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\nused on any tests changed\n- [ ] The PR description includes the
appropriate Release Notes section,\nand the correct `release_note:*`
label is applied per
the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[ ] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Identify risks\n\nDoes this
PR introduce any risks? For example, consider risks like hard\nto test
bugs, performance regression, potential of data loss.\n\nDescribe the
risk, its severity, and mitigation for each identified\nrisk. Invite
stakeholders and evaluate how to proceed before merging.\n\n- [ ] [See
some
risk\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)\n-
[ ] ...\n\n---------\n\nCo-authored-by: Elastic Machine
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Disable ES|QL field stats for TS command (#247641)\n\n## Summary\n\nThis
PR disables ES|QL field stats for TS command\n\n<img width=\"1675\"
height=\"649\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/ea0ffa24-4dc6-434e-a86b-f2237285f8e3\"\n/>\n\n###
Checklist\n\nCheck the PR satisfies following conditions. \n\nReviewers
should verify this PR satisfies this list as well.\n\n- [ ] Any text
added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[
]\n[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)\nwas
added for features that require explanation or tutorials\n- [ ] [Unit or
functional\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\nwere
updated or added to match the most common scenarios\n- [ ] If a plugin
configuration key changed, check if it needs to be\nallowlisted in the
cloud and added to the
[docker\nlist](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)\n-
[ ] This was checked for breaking HTTP API changes, and any
breaking\nchanges have been approved by the breaking-change committee.
The\n`release_note:breaking` label should be applied in these
situations.\n- [ ] [Flaky
Test\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\nused on any tests changed\n- [ ] The PR description includes the
appropriate Release Notes section,\nand the correct `release_note:*`
label is applied per
the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[ ] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Identify risks\n\nDoes this
PR introduce any risks? For example, consider risks like hard\nto test
bugs, performance regression, potential of data loss.\n\nDescribe the
risk, its severity, and mitigation for each identified\nrisk. Invite
stakeholders and evaluate how to proceed before merging.\n\n- [ ] [See
some
risk\nexamples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)\n-
[ ] ...\n\n---------\n\nCo-authored-by: Elastic Machine
<elasticmachine@users.noreply.github.com>","sha":"5dd3032ce7378f1c126eb6c72ca15869d95a7c2c"}},{"branch":"9.2","label":"v9.2.4","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Quynh Nguyen (Quinn) <43350163+qn895@users.noreply.github.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

Author: 3 people

x-pack/platform/plugins/private/data_visualizer/public/application/index_data_visualizer/utils/get_reason_fieldstats_unavailable_for_esql_query.ts

@@ -10,10 +10,21 @@ import type { AggregateQuery } from '@kbn/es-query';
 import type { Query } from '@kbn/es-query';
 import { queryCannotBeSampled } from '@kbn/esql-utils';
 import { i18n } from '@kbn/i18n';
+import { isOfAggregateQueryType } from '@kbn/es-query';
 
 export const getReasonIfFieldStatsUnavailableForQuery = (
   query?: AggregateQuery | Query | { [key: string]: any }
 ): string | undefined => {
+  // Currently we can't support TS command because missing count() support
+  if (query && isOfAggregateQueryType(query) && query.esql) {
+    const trimmedQuery = query.esql.trim();
+    if (trimmedQuery.toLowerCase().startsWith('ts')) {
+      return i18n.translate('xpack.dataVisualizer.fieldStats.unavailableForTSQuery', {
+        defaultMessage: `Field statistics are not available for ES|QL with the TS command.`,
+      });
+    }
+  }
+
   if (queryCannotBeSampled(query)) {
     return i18n.translate('xpack.dataVisualizer.fieldStats.unavailableForESQLQueryDescription', {
       defaultMessage: `Field statistics are not available for ES|QL queries with 'MATCH' or 'QSTR' functions.`,