Merge #4509 #4511 #4512

4509: [ImgBot] Optimize images r=npepinpe a=imgbot[bot]

## Beep boop. Your images are optimized!

Your image file size has been reduced by **30%** 🎉

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| File | Before | After | Percent reduction |
|:--|:--|:--|:--|
| /docs/src/reference/message-correlation/message-single-instance.png | 74.97kb | 14.56kb | 80.58% |
| /docs/src/bpmn-workflows/error-events/error-throw-events.png | 155.91kb | 37.03kb | 76.25% |
| /docs/src/bpmn-workflows/error-events/error-events.png | 155.59kb | 42.64kb | 72.60% |
| /docs/src/reference/message-correlation/message-aggregator.png | 51.84kb | 15.40kb | 70.30% |
| /docs/src/bpmn-workflows/call-activities/call-activities-boundary-events.png | 7.56kb | 2.67kb | 64.75% |
| /docs/src/bpmn-workflows/event-subprocesses/event-subprocess.png | 90.17kb | 36.25kb | 59.79% |
| /docs/src/kubernetes/operate-dashboard.png | 285.60kb | 132.68kb | 53.54% |
| /docs/src/kubernetes/operate-login.png | 238.71kb | 115.05kb | 51.80% |
| /docs/src/getting-started/img/tutorial-3.6-label-xor-gateway.png | 167.83kb | 83.63kb | 50.17% |
| /docs/src/getting-started/img/tutorial-3.11-process-id.png | 221.06kb | 110.69kb | 49.93% |
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| /docs/src/getting-started/img/tutorial-3.8-default-flow.png | 217.78kb | 112.77kb | 48.22% |
| /docs/src/getting-started/img/tutorial-3.9-condition-expression.png | 234.53kb | 125.82kb | 46.35% |
| /docs/src/getting-started/img/tutorial-3.7-no-insurance-task.png | 225.72kb | 123.71kb | 45.19% |
| /docs/src/getting-started/img/tutorial-3.5-add-xor-gateway.png | 165.75kb | 93.23kb | 43.75% |
| /docs/src/getting-started/img/tutorial-3.3-add-message-name.png | 234.46kb | 132.56kb | 43.46% |
| /docs/src/getting-started/img/tutorial-3.4-add-correlation-key.png | 230.26kb | 130.42kb | 43.36% |
| /docs/src/getting-started/img/tutorial-3.2-modeler-message-event.png | 186.98kb | 111.68kb | 40.27% |
| /docs/src/getting-started/img/tutorial-3.10-end-event.png | 24.73kb | 19.44kb | 21.38% |
| /docs/src/kubernetes/zeebe-helm-charts.png | 133.48kb | 107.81kb | 19.24% |
| /monitor/grafana/preview.png | 186.97kb | 151.24kb | 19.11% |
| /docs/src/kubernetes/zeebe-operator-flow.png | 64.10kb | 52.40kb | 18.24% |
| /docs/src/kubernetes/zeebe-k8s-helm.png | 146.33kb | 121.32kb | 17.09% |
| /docs/src/operations/grafana-preview.png | 166.81kb | 140.33kb | 15.87% |
| /docs/src/clients/java-client/java-get-started-monitor-1.gif | 73.15kb | 66.22kb | 9.47% |
| /docs/src/clients/go-client/java-get-started-monitor-1.gif | 73.15kb | 66.22kb | 9.47% |
| /docs/src/clients/java-client/java-get-started-monitor-3.gif | 111.49kb | 101.22kb | 9.21% |
| /docs/src/bpmn-workflows/parallel-gateways/parallel-gateway.gif | 226.29kb | 208.37kb | 7.92% |
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| /docs/src/bpmn-workflows/event-based-gateways/event-based-gateway.gif | 219.37kb | 203.25kb | 7.35% |
| /docs/src/clients/go-client/java-get-started-monitor-2.gif | 140.60kb | 130.70kb | 7.04% |
| /docs/src/clients/java-client/java-get-started-monitor-2.gif | 140.60kb | 130.70kb | 7.04% |
| /docs/src/bpmn-workflows/event-subprocesses/zeebe-modeler-event-subprocess.gif | 200.03kb | 186.55kb | 6.74% |
| /docs/src/bpmn-workflows/sub-process.gif | 38.74kb | 36.17kb | 6.64% |
| /docs/src/bpmn-workflows/none-events/start-event.gif | 129.59kb | 121.13kb | 6.52% |
| /docs/src/bpmn-workflows/timer-events/non-interrupting-timer-event.gif | 215.44kb | 203.26kb | 5.65% |
| /docs/src/bpmn-workflows/call-activities/call-activities-example.png | 21.96kb | 20.80kb | 5.26% |
| /docs/src/bpmn-workflows/none-events/end-event.gif | 92.70kb | 88.07kb | 4.99% |
| /docs/src/bpmn-workflows/call-activities/bpmn-modeler-call-activity.gif | 98.01kb | 93.29kb | 4.81% |
| /docs/src/bpmn-workflows/multi-instance/bpmn-modeler-multi-instance.gif | 99.27kb | 94.75kb | 4.56% |
| /docs/src/bpmn-workflows/error-events/bpmn-modeler-error-events.gif | 227.74kb | 218.13kb | 4.22% |
| /docs/src/zeebe-brand.svg | 0.65kb | 0.64kb | 1.65% |
| | | | |
| **Total :** | **6,485.91kb** | **4,549.66kb** | **29.85%** |
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4511: chore(deps): update docker.elastic.co/elasticsearch/elasticsearch-oss docker tag to v6.8.9 r=npepinpe a=renovate[bot]

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [docker.elastic.co/elasticsearch/elasticsearch-oss](https://togithub.com/elastic/elasticsearch) | patch | `6.8.8` -> `6.8.9` |

---

### Release Notes

<details>
<summary>elastic/elasticsearch</summary>

### [`v6.8.9`](https://togithub.com/elastic/elasticsearch/releases/v6.8.9)

[Compare Source](https://togithub.com/elastic/elasticsearch/compare/v6.8.8...v6.8.9)

Downloads: <https://elastic.co/downloads/elasticsearch>
Release notes: <https://www.elastic.co/guide/en/elasticsearch/reference/6.8/release-notes-6.8.9.html>

</details>

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#zeebe-io/zeebe).

4512: chore(deps): update docker.elastic.co/kibana/kibana-oss docker tag to v6.8.9 r=npepinpe a=renovate[bot]

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.elastic.co/kibana/kibana-oss | patch | `6.8.8` -> `6.8.9` |

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#zeebe-io/zeebe).

Co-authored-by: ImgBotApp <ImgBotHelp@gmail.com>
Co-authored-by: Renovate Bot <bot@renovateapp.com>

exporters/elasticsearch-exporter/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 
 services:
     elasticsearch:
-        image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.8.8
+        image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.8.9
         ports:
             - "9200:9200"
             - "9300:9300"
@@ -11,7 +11,7 @@ services:
             - cluster.name=test
 
     kibana:
-        image: docker.elastic.co/kibana/kibana-oss:6.8.8
+        image: docker.elastic.co/kibana/kibana-oss:6.8.9
         ports:
             - "5601:5601"
         links: