Adds cross-links for AI Assistant docs (#2666)

Fixes [5455](elastic/security-docs/issues/5455) and fixes #2665.

Preliminary step to make AI Assistant content more findable. Adds some
more links to related content that's currently siloed, and makes some
minor edits to the solution-agnostic AI Assistant page.

Also adds the Elastic Managed LLM to the Security LLM connector setup
guides landing page (#2665).

Author: benironside

explore-analyze/ai-assistant.md

@@ -12,31 +12,33 @@ applies_to:
 products:
   - id: kibana
   - id: observability
+  - id: security
   - id: cloud-serverless
 ---
 
 # AI assistant
 
 $$$token-limits$$$
 
-**AI Assistant** is a chat-based interactive tool to help you with a variety of tasks related to Elasticsearch and Kibana, including:
+**AI Assistant** is a chat-based interactive tool that can help with a variety of tasks throughout Elasticsearch and Kibana, including:
 
 - **Constructing queries**: Assists you in building queries to search and analyze your data, including converting queries from other languages to [ES|QL](query-filter/languages/esql.md).
 - **Indexing data**: Guides you on how to index data into Elasticsearch.
 - **Using APIs**: Calls Elasticsearch APIs on your behalf if you need specific operations performed.
 - **Generating sample data**: Helps you create sample data for testing and development purposes.
 - **Visualizing and analyzing data**: Assists you in creating visualizations and analyzing your data using Kibana.
 - **Troubleshooting**: Explains errors, messages, and suggests remediation.
+- **Investigating threats**: Helps analyze potential attacks, provides threat research, and assists with alert triage.
 
-AI Assistant requires specific privileges and a generative AI connector.
-
-% Check [Configure AI Assistant](../deploy-manage/) for more details on how to enable and configure it.
-
-The capabilities and ways to interact with AI Assistant can differ for each solution. Find more information in the respective solution docs:
+AI Assistant requires specific privileges and a large language model (LLM) connector. The capabilities and ways to interact with AI Assistant can differ for each solution. To learn more about how it works in each solution, refer to:
 
 - [{{obs-ai-assistant}}](../solutions/observability/observability-ai-assistant.md)
 - [AI Assistant for Security](../solutions/security/ai/ai-assistant.md)
 
+To learn more about configuring LLM connectors, refer to:
+
+- [Enable LLM access](../solutions/security/ai/set-up-connectors-for-large-language-models-llm.md)
+
 ## Prompt best practices [rag-for-esql]
 Elastic AI Assistant allows you to take full advantage of the Elastic platform to improve your operations. It can help you write an ES|QL query for a particular use case, or answer general questions about how to use the platform. Its ability to assist you depends on the specificity and detail of your questions. The more context and detail you provide, the more tailored and useful its responses will be.
 

solutions/observability/observability-ai-assistant.md

@@ -530,3 +530,8 @@ Anonymization has the following limitations:
 ### Token limits [obs-ai-token-limits]
 
 Most LLMs have a set number of tokens they can manage in single a conversation. When you reach the token limit, the LLM will throw an error, and Elastic will display a "Token limit reached" error in Kibana. The exact number of tokens that the LLM can support depends on the LLM provider and model you’re using. If you use an OpenAI connector, monitor token utilization in **OpenAI Token Usage** dashboard. For more information, refer to the [OpenAI Connector documentation](kibana://reference/connectors-kibana/openai-action-type.md#openai-connector-token-dashboard).
+
+
+## AI Assistant for Security
+
+The capabilities and ways to interact with AI Assistant can differ for each solution. For more information about how AI Assistant works in {{elastic-sec}}, refer to [AI Assistant for Security](/solutions/security/ai/ai-assistant.md).

solutions/security/ai/ai-assistant.md

@@ -177,3 +177,10 @@ In addition to practical advice, AI Assistant can offer conceptual advice, tips,
 
 * “How do I set up a {{ml}} job in {{elastic-sec}} to detect anomalies in network traffic volume over time?”
 * “I need to monitor for unusual file creation patterns that could indicate ransomware activity. How would I construct this query using EQL?”
+
+
+## Learn more 
+
+- For more information about how AI Assistant works in Observability and Search, refer to [{{obs-ai-assistant}}](/solutions/observability/observability-ai-assistant.md).
+
+The capabilities and ways to interact with AI Assistant can differ for each solution. For more information about how AI Assistant works in Observability and Search, refer to [{{obs-ai-assistant}}](/solutions/observability/observability-ai-assistant.md).

solutions/security/ai/set-up-connectors-for-large-language-models-llm.md

@@ -19,6 +19,11 @@ products:
 Different LLMs have varying performance when used to power different features and use-cases. For more information about how various models perform on different tasks in {{elastic-sec}}, refer to the [Large language model performance matrix](/solutions/security/ai/large-language-model-performance-matrix.md).
 :::
 
+## Elastic Managed LLM
+
+:::{include} ../../_snippets/elastic-managed-llm.md
+:::
+
 ## Connect to a third-party LLM
 
 Follow these guides to connect to one or more third-party LLM providers: