[Zookeeper] Added dimensions mapping to server datastream

[agithomas]

• Enhancement

What does this PR do?

Added dimension mapping for server datastream.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

• elastic-package build
• Mapping tests completed
• Dashboard tests completed

Related issues

• [Zookeeper] TSDB Enablement #7752

Screenshots

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• Start Time: 2023-10-11T13:26:00.731+0000

• Duration: 15 min 50 sec

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Failed	0
Passed	7
Skipped	0
Total	7

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Name	Metrics % (covered/total)	Diff
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Methods	66.667% (6/9)	👍 38.889
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[agithomas]

Settings verification

      "hidden": "true",
      "time_series": {
        "end_time": "2023-10-04T14:47:17.000Z",
        "start_time": "2023-10-04T04:20:16.000Z"
      },

Mapping check

             "mode": {
                "type": "keyword",
                "time_series_dimension": true
              },
              "node_count": {
                "type": "long",
                "time_series_metric": "gauge"
              },
              "outstanding": {
                "type": "long",
                "time_series_metric": "gauge"
              },
              "received": {
                "type": "long",
                "time_series_metric": "counter"
              },
              "sent": {
                "type": "long",
                "time_series_metric": "counter"
              },
              "version_date": {
                "type": "date"
              },
              "zxid": {
                "type": "keyword",
                "time_series_dimension": true
              }

Rollover Testing

GET _index_template/metrics-zookeeper.server

PUT _index_template/metrics-zookeeper.server
{
      "index_patterns": [
        "metrics-zookeeper.server-*"
      ],
      "template": {
        "settings": {
          "index": {
            "mode": null
          }
        }
    },
    "composed_of": [
          "metrics-zookeeper.server@package",
          "metrics-zookeeper.server@custom",
          ".fleet_globals-1",
          ".fleet_agent_id_verification-1"
    ],
    "priority": 200,
    "data_stream": {
      "hidden": false,
      "allow_custom_routing": false
    }
}

POST metrics-zookeeper.server-default/_rollover

{
  "acknowledged": true,
  "shards_acknowledged": true,
  "old_index": ".ds-metrics-zookeeper.server-default-2023.10.04-000003",
  "new_index": ".ds-metrics-zookeeper.server-default-2023.10.04-000004",
  "rolled_over": true,
  "dry_run": false,
  "conditions": {}
}

[ritalwar]

LGTM!

[elasticmachine]

Package zookeeper - 1.8.5 containing this change is available at https://epr.elastic.co/search?package=zookeeper