updating landing page for reference

reference/index.md

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 # Reference [api-reference]
 
+Explore the reference documentation for the Elastic Stack. Whether you are configuring security protocols, enhancing search functionalities, or integrating with cloud services, our detailed manuals, API guides, and configuration settings provide the information you need.
+
+## Security
+
+Access detailed reference documentation on field and object schemas as well as the diffferent commands used to manage and troubleshoot Elastic Endpoint.
+
+**Learn more in [Security](security/index.md)**
+
+## Observability
+
+Access detailed reference documentation on field and object schemas as well as the Elastic Entity Model.
+
+**Learn more in [Observability](observability/index.md)**
+
+## Search
+
+Explore reference content on Search UI and how you can develop fast, modern, and engaging search experiences.
+
+**Learn more in [Search](search/index.md)**
+
+## Elasticsearch and index management
+
+Customize your Elastic Stack setup with our configuration reference guides. Explore JVM settings, client documentation, Elasticsearch privileges, and index lifecycle actions to find the detailed information you need to configure your environment to your specific needs.
+
+**Learn more in [Elasticsearch and index management](elasticsearch://reference/index.md)**
+
+## Ingestion tools
+
+Streamline data ingestion with tools like Fleet and Elastic Agent, APM, and Beats. Explore processor references and Logstash plugins to efficiently manage your data flow.
+
+**Learn more in [Ingestion tools](ingestion-tools/index.md)**
+
+## Kibana
+
+Visualize and analyze your data with Kibana. Configure advanced settings, explore plugins, and utilize command line tools to enhance your data insights.
+
+**Learn more in [Kibana](kibana://reference/index.md)**
+
+## Plugins
+
+Extend the functionality of your Elastic Stack with a variety of plugins. From analysis and discovery to snapshot/restore and store plugins, customize your setup to fit your requirements.
+
+**Learn more in [Plugins](elasticsearch://reference/elasticsearch-plugins/index.md)**
+
+## Query Languages
+
+Master data querying with our comprehensive guides on QueryDSL, ES|QL, SQL, EQL, and Kibana Query Language. 
+
+**Learn more in [Query languages](elasticsearch://reference/query-languages/index.md)**
+
+## Scripting Languages
+
+Access syntax references, function libraries, and best practices for Painless scripting.
+
+**Learn more in [Painless scripting](elasticsearch://reference/scripting-languages/painless/painless.md)**
+
+## Data analysis
+
+Unlock insights with powerful data analysis tools. Utilize text analysis components, aggregations, and function references to derive meaningful conclusions from your data.
+
+**Learn more in [Data analysis](data-analysis/index.md)**
+
+## ECS (Elastic Common Schema) reference
+
+Standardize your data with ECS. Access logging libraries, field references, and categorization fields to ensure consistency and compatibility across your data sources.
+
+**Learn more in [ECS](ecs://reference/index.md)**
+
+## Cloud
+
+Leverage the power of the cloud with Elastic Cloud solutions. Explore Elastic Cloud on Kubernetes, Elastic Cloud Enterprise, and Elastic Cloud Hosted to scale your operations.
+
+**Learn more in [Cloud](cloud://reference/index.md)**
+
+## APIs
 Explore the reference documentation for Elastic APIs.
 
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