[docs] Migrate docs from AsciiDoc to Markdown

docs/reference/advanced-usage.md

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+---
+navigation_title: "Advanced usage"
+mapped_pages:
+  - https://www.elastic.co/guide/en/search-ui/current/guides-using-with-vue-js.html
+---
+
+# Using with Vue.js [guides-using-with-vue-js]
+
+
+While Search UI doesn’t have a component library for Vue.js, you can still use them together, just with a little extra work.
+
+To achieve that you’ll need to import and work directly with Search UI Core API. Read a short [API reference](/reference/api-reference.md) guide for high-level overview on the approach.
+
+Once you’re familiar with the concept of Search UI core, the following docs will give you deeper dive into available APIs:
+
+* [Core API](/reference/api-core-configuration.md)
+* [State](/reference/api-core-state.md)
+* [Actions](/reference/api-core-actions.md)
+
+
+## Example [guides-using-with-vue-js-example]
+
+The following demo is a good starting point for your Search UI implementation. The source code is available on GitHub: [https://github.com/elastic/search-ui/tree/main/examples/vue](https://github.com/elastic/search-ui/tree/main/examples/vue)
+
+:::{tip}
+Check out our Vue.js integration demo in [CodeSandbox](https://codesandbox.io/embed/github/elastic/search-ui/tree/main/examples/vue).
+
+The example demonstrates how to implement Search UI in a Vue.js application.
+:::
+
+
+
+
+
+
+

docs/reference/api-connectors-app-search.md

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+---
+navigation_title: "Connectors API"
+mapped_pages:
+  - https://www.elastic.co/guide/en/search-ui/current/api-connectors-app-search.html
+---
+
+# App Search Connector [api-connectors-app-search]
+
+
+::::{admonition} Deprecation Notice
+:class: important
+
+App Search connector for Search UI is deprecated and will no longer be supported. Please migrate to [Elasticsearch Connector](/reference/tutorials-elasticsearch.md) for continued support.
+
+::::
+
+
+This Connector is used to connect Search UI to Elastic’s [App Search](https://www.elastic.co/cloud/app-search-service) API.
+
+
+## Usage [api-connectors-app-search-usage]
+
+```shell
+npm install --save @elastic/search-ui-app-search-connector
+```
+
+```js
+import AppSearchAPIConnector from "@elastic/search-ui-app-search-connector";
+
+const connector = new AppSearchAPIConnector({
+  searchKey: "search-371auk61r2bwqtdzocdgutmg",
+  engineName: "search-ui-examples",
+  endpointBase: "http://127.0.0.1:3002"
+});
+```
+
+
+### Additional options [api-connectors-app-search-additional-options]
+
+Additional options will be passed through to the underlying [APIclient](https://github.com/elastic/app-search-javascript). Any valid parameter of the client can be used.
+
+```js
+const connector = new AppSearchAPIConnector({
+  searchKey: "search-371auk61r2bwqtdzocdgutmg",
+  engineName: "search-ui-examples",
+  endpointBase: "http://127.0.0.1:3002",
+  cacheResponses: false
+});
+```
+
+
+## Options [api-connectors-app-search-options]
+
+| Param | Description |
+| --- | --- |
+| searchKey | Required. String. Credential found in your App Search Dashboard |
+| engineName | Required. String. Engine to query, found in your App Search Dashboard |
+| endpointBase | Required. String. Endpoint path, found in your App Search Dashboard |
+| cacheResponses | Optional. Boolean. Default is true. By default, connector will keep an in browser memory result cache of previous requests. |
+| hostIdentifier | Optional. Useful when proxying the Swiftype API or developing against a local API server. |
+| beforeSearchCall | Optional. A hook to amend query options before the request is sent to the API in a query on an "onSearch" event. |
+| beforeAutocompleteResultsCall | Optional. A hook to amend query options before the request is sent to the API in a "results" query on an "onAutocomplete" event. |
+| beforeAutocompleteSuggestionsCall | Optional. A hook to amend query options before the request is sent to the API in a "suggestions" query on an "onAutocomplete" event. |
+
+
+
+