Merge pull request ClickHouse#78990 from ClickHouse/update-system-zookeeper-connections

Update zookeeper_connection.md

Author: bharatnc

docs/en/operations/system-tables/zookeeper_connection.md

@@ -18,14 +18,16 @@ Columns:
 
 -   `name` ([String](../../sql-reference/data-types/string.md)) — ZooKeeper cluster's name.
 -   `host` ([String](../../sql-reference/data-types/string.md)) — The hostname/IP of the ZooKeeper node that ClickHouse connected to.
--   `port` ([String](../../sql-reference/data-types/string.md)) — The port of the ZooKeeper node that ClickHouse connected to.
--   `index` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config.
+-   `port` ([UIn16](../../sql-reference/data-types/int-uint.md)) — The port of the ZooKeeper node that ClickHouse connected to.
+-   `index` ([Nullable(UInt8)](../../sql-reference/data-types/int-uint.md)) — The index of the ZooKeeper node that ClickHouse connected to. The index is from ZooKeeper config. If not connected, this column is NULL.
 -   `connected_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — When the connection was established
--   `session_uptime_elapsed_seconds` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Seconds elapsed since the connection was established
+-   `session_uptime_elapsed_seconds` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Seconds elapsed since the connection was established.
 -   `is_expired` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Is the current connection expired.
--   `keeper_api_version` ([String](../../sql-reference/data-types/string.md)) — Keeper API version.
--   `client_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Session id of the connection.
--   `xid` ([Int32](../../sql-reference/data-types/int-uint.md)) — Xid of the current session.
+-   `keeper_api_version` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Keeper API version.
+-   `client_id` ([Int64](../../sql-reference/data-types/int-uint.md)) — Session id of the connection.
+-   `xid` ([Int64](../../sql-reference/data-types/int-uint.md)) — XID of the current session.
+-   `enabled_feature_flags` ([Array(Enum16)](../../sql-reference/data-types/array.md)) — Feature flags which are enabled. Only applicable to ClickHouse Keeper. Possible values are `FILTERED_LIST`, `MULTI_READ`, `CHECK_NOT_EXISTS`, `CREATE_IF_NOT_EXISTS`, `REMOVE_RECURSIVE`.
+-   `availability_zone` ([String](../../sql-reference/data-types/string.md)) — Availability zone.
 
 Example:
 
@@ -34,7 +36,7 @@ SELECT * FROM system.zookeeper_connection;
 ```
 
 ```text
-┌─name────┬─host──────┬─port─┬─index─┬──────connected_time─┬─session_uptime_elapsed_seconds─┬─is_expired─┬─keeper_api_version─┬─client_id─┐
-│ default │ 127.0.0.1 │ 9181 │     0 │ 2023-06-15 14:36:01 │                           3058 │          0 │                  3 │         5 │
-└─────────┴───────────┴──────┴───────┴─────────────────────┴────────────────────────────────┴────────────┴────────────────────┴───────────┘
+┌─name────┬─host──────┬─port─┬─index─┬──────connected_time─┬─session_uptime_elapsed_seconds─┬─is_expired─┬─keeper_api_version─┬─client_id─┬─xid─┬─enabled_feature_flags────────────────────────────────────────────────────┬─availability_zone─┐
+│ default │ 127.0.0.1 │ 2181 │     0 │ 2025-04-10 14:30:00 │                            943 │          0 │                  0 │       420 │  69 │ ['FILTERED_LIST','MULTI_READ','CHECK_NOT_EXISTS','CREATE_IF_NOT_EXISTS'] │ eu-west-1b        │
+└─────────┴───────────┴──────┴───────┴─────────────────────┴────────────────────────────────┴────────────┴────────────────────┴───────────┴─────┴──────────────────────────────────────────────────────────────────────────┴───────────────────┘
 ```