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Elasticsearch version 7.11.2

Also see Breaking changes in 7.11.

Known issues

Snapshot and restore: If an index is deleted while the cluster is concurrently taking more than one snapshot then there is a risk that one of the snapshots may never complete and also that some shard data may be lost from the repository, causing future restore operations to fail. To mitigate this problem, set snapshot.max_concurrent_operations: 1 to prevent concurrent snapshot operations:
```
PUT _cluster/settings
{
  "persistent" : {
    "snapshot.max_concurrent_operations" : 1
  }
}
```
This issue is fixed in Elasticsearch versions 7.13.1 and later. It is not possible to repair a repository once it is affected by this issue, so you must restore the repository from a backup, or clear the repository by executing DELETE _snapshot/<repository name>/*, or move to a fresh repository. For more details, see #73456.
Parsing a request when the last element in an array is filtered out (for instance using _source_includes) fails. This is due to a bug in Jackson parser. Fixed in Elasticsearch 8.6.1 (#91456)
The deprecated index.mapper.dynamic setting can break your cluster. It can only be set using the Update index settings API. Symptoms include nodes failing to start or shards failing to allocate. Do not use this setting in versions prior to 7.17.22. The bug is fixed in 7.17.22. (issue: #109160)

Enhancements

Authorization

Improve shard level request cache efficiency #69505

Bug fixes

Aggregations

Fix filter by filter execution with doc_count #68930
Revert "Remove aggregation’s postCollect phase #68615 (issues: #64016, #66876, #67839)

Features/Data streams

Don’t mark backing indices of overlapping data streams as conflicts #69625

Features/ILM+SLM

Fix bug in multiple repo SLM retention #70047 (issue: #70029)

Features/Indices APIs

Require master node for watcher template #69147 (issue: #66837)

Features/Ingest

Async processors and final pipelines are broken #69818 (issue: #52339)
Copy_from on set processor should deep copy non-primitive mutable types #69349 (issue: #69348)

Infra/Plugins

Allow file read permissions in plugins #69643 (issue: #69464)

Machine Learning

Avoid memory tracker race condition #69290 (issue: #69289)
Fix logic for moving .ml-state-write alias from legacy to new #69039 (issue: #68925)

Mapping

Collect multiple paths from XContentMapValues #68540 (issue: #68215)

SQL

Fix the inconsistent behaviour of ISO_WEEK_YEAR() #68758 (issue: #67872)
Make RestSqlQueryAction thread-safe #69895 (issue: #69866)

Snapshot/Restore

Fix Leaking Listener in BlobStoreRepository #69110
Remove blocking on generic thread pool in GET snapshots #69101 (issue: #69099)
URL repos and searchable snapshots don’t mix #69197 (issue: #68918)

Transform

Stop transform regardless of transform nodes #69419 (issue: #69260)
Prevent concurrent state persistence when indexer gets triggered during shutdown #69551 (issue: #67121)

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.11.2.html