Re-add "mapped-pages" to troubleshooting docs

Author: swallez

docs/docset.yml

@@ -9,8 +9,6 @@ toc:
   - toc: reference
   - toc: release-notes
 subs:
-  serverless-full:   "Elastic Cloud Serverless"
-  es3:   "Elasticsearch Serverless"
   es:   "Elasticsearch"
   version: "9.0.0"
   # Not used by docs-builder, but present in `% :::{include-bloc}` preprocessing directives (see IncludeExpander.java)

docs/reference/troubleshooting/index.md

@@ -1,3 +1,8 @@
+---
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/troubleshooting.html
+---
+
 # Troubleshooting
 
 ## Exceptions

docs/reference/troubleshooting/io-reactor-errors.md

@@ -1,5 +1,7 @@
 ---
 navigation_title: IOReactor errors
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/io-reactor-errors.html
 ---
 
 # Apache http-client I/O reactor errors

docs/reference/troubleshooting/missing-required-property.md

@@ -1,5 +1,7 @@
 ---
 navigation_title: Missing required property
+mapped_pages:
+- https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/missing-required-property.html
 ---
 
 # Missing required property exception in a response

docs/reference/troubleshooting/no-such-method-request-options.md

@@ -1,5 +1,7 @@
 ---
 navigation_title: "NoSuchMethodError: removeHeader"
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/no-such-method-request-options.html
 ---
 
 # `NoSuchMethodError` when creating a client

docs/reference/troubleshooting/serialize-without-typed-keys.md

@@ -1,5 +1,7 @@
 ---
 navigation_title: Serializing without typed keys
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/serialize-without-typed-keys.html
 ---
 
 # Serializing aggregations and suggestions without typed keys