Fix 404s in REST API landing page (#133086)

* Update index.md

removed or corrected 404 links

* Update index.md

fixing broken link

* Update index.md

Fix remaining bad links

docs/reference/elasticsearch/rest-apis/index.md

@@ -261,7 +261,7 @@ The index APIs enable you to manage individual indices, index settings, aliases,
 | [Shrink index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-shrink) | Shrinks an existing index into a new index with fewer primary shards. |
 | [Split index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-split) | Splits an existing index into a new index with more primary shards. |
 | [Clone index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-clone) | Clones an existing index into a new index. |
-| [Manage index aliases](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-alias) | Manages index aliases. |
+| [Check alias](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-exists-alias) | Manages index aliases. |
 | [Update field mappings](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-put-mapping) | Updates index mappings. |
 | [Get field mappings](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-mapping) | Retrieves index mappings. |
 | [Get index settings](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-settings) | Retrieves settings for one or more indices. |
@@ -278,10 +278,8 @@ The index APIs enable you to manage individual indices, index settings, aliases,
 | [Flush index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-flush) | Performs a flush operation on one or more indices. |
 | [Clear index cache](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-clear-cache) | Clears caches associated with one or more indices. |
 | [Force merge index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-forcemerge) | Merges index segments to reduce their number and improve performance. |
-| [Freeze index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-freeze) | Freezes an index, making it read-only and minimizing its resource usage. |
-| [Unfreeze index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-unfreeze) | Unfreezes a frozen index, making it writeable and fully functional. |
 | [Rollover index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-rollover) | Rolls over an alias to a new index when conditions are met. |
-| [Resolve index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-resolve) | Resolves expressions to index names, aliases, and data streams. |
+| [Resolve index](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-resolve-index) | Resolves expressions to index names, aliases, and data streams. |
 | [Simulate index template](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-simulate-index-template) | Simulates the application of a composable index template. |
 | [Simulate template](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-simulate-template) | Simulates the application of a legacy index template. |
 | [Get mapping](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-mapping) | Retrieves mapping definitions for one or more indices. |
@@ -337,9 +335,6 @@ The ingest APIs enable you to manage tasks and resources related to ingest pipel
 | [Delete pipeline](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-delete-pipeline) | Deletes an ingest pipeline. |
 | [Simulate pipeline](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-simulate) | Simulates a document through an ingest pipeline. |
 | [Get built-in grok patterns](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-processor-grok) | Returns a list of built-in grok patterns. |
-| [Get processor types](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-processor-types) | Returns a list of available processor types. |
-| [Put pipeline processor](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-put-processor) | Creates or updates a custom pipeline processor. |
-| [Delete pipeline processor](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ingest-delete-processor) | Deletes a custom pipeline processor. |
 
 ### [Licensing](https://www.elastic.co/docs/api/doc/elasticsearch/v9/group/endpoint-license)
 
@@ -422,7 +417,7 @@ The machine learning data frame analytics APIs enbale you to perform data frame
 | API | Description |
 | --- | ----------- |
 | [Create a data frame analytics job](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-put-data-frame-analytics) | Creates a data frame analytics job. |
-| [Get data frame analytics job configuration info](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-get-data-frame-analyticss) | Retrieves configuration and results for analytics jobs. |
+| [Get data frame analytics job configuration info](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-get-data-frame-analytics) | Retrieves configuration and results for analytics jobs. |
 | [Delete a data frame analytics job](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-delete-data-frame-analytics) | Deletes a data frame analytics job. |
 | [Start a data frame analytics job](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-start-data-frame-analytics) | Starts a data frame analytics job. |
 | [Stop data frame analytics jobs](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-ml-stop-data-frame-analytics) | Stops a running data frame analytics job. |
@@ -466,9 +461,9 @@ Query rules enable you to configure per-query rules that are applied at query ti
 
 | API | Description |
 | --- | ----------- |
-| [Create or update query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-ruleset-put-query-ruleset) | Creates or updates a query ruleset. |
-| [Get query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-ruleset-get-query-ruleset) | Retrieves one or more query rulesets. |
-| [Delete query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-ruleset-delete-query-ruleset) | Deletes a query ruleset. |
+| [Create or update query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-rules-put-ruleset) | Creates or updates a query ruleset. |
+| [Get query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-rules-get-ruleset) | Retrieves one or more query rulesets. |
+| [Delete query ruleset](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-query-rules-delete-ruleset) | Deletes a query ruleset. |
 
 ### [Rollup](https://www.elastic.co/docs/api/doc/elasticsearch/v9/group/endpoint-rollup)
 
@@ -491,10 +486,10 @@ Use the script support APIs to get a list of supported script contexts and langu
 
 | API | Description |
 | --- | ----------- |
-| [Add or update stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-script-put-script) | Adds or updates a stored script. |
-| [Get stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-script-get-script) | Retrieves a stored script. |
-| [Delete stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-script-delete-script) | Deletes a stored script. |
-| [Execute Painless script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-script-painless-execute) | Executes a script using the Painless language. |
+| [Add or update stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-put-script) | Adds or updates a stored script. |
+| [Get stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-get-script) | Retrieves a stored script. |
+| [Delete stored script](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-delete-script) | Deletes a stored script. |
+| [Execute Painless script]https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-scripts-painless-execute) | Executes a script using the Painless language. |
 | [Get script contexts](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-get-script-context) | Returns available script execution contexts. |
 | [Get script languages](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-get-script-languages) | Returns available scripting languages. |
 
@@ -509,7 +504,6 @@ The search APIs enable you to search and aggregate data stored in {{es}} indices
 | [Search template](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-search-template) | Executes a search using a stored or inline template. |
 | [Render search template](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-render-search-template) | Renders a search template with parameters. |
 | [Explain search](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-explain) | Explains how a document scores against a query. |
-| [Validate query](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-validate-query) | Validates a query without executing it. |
 | [Get field capabilities](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-field-caps) | Returns the capabilities of fields across indices. |
 | [Scroll search](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-scroll) | Efficiently retrieves large numbers of results (pagination). |
 | [Clear scroll](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-clear-scroll) | Clears search contexts for scroll requests. |
@@ -608,9 +602,9 @@ The synonyms management APIs provide a convenient way to define and manage synon
 | --- | ----------- |
 | [Get synonym set](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-synonyms-get-synonym) | Retrieves a synonym set by ID. |
 | [Create of update synonym set](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-synonyms-put-synonym) | Creates or updates a synonym set. |
-| [Delete synonym set](https://www.elastic.co/docs/api/doc/elasticsearch/endpoint/synonyms.delete_synonym) | Deletes a synonym set. |
+| [Delete synonym set](https://www.elastic.co/docs/api/doc/elasticsearch/endpoint/operation/operation-synonyms-delete-synonym) | Deletes a synonym set. |
 | [Get synonym rule](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-synonyms-get-synonym-rule) | |
-| [Get synonym sets](https://www.elastic.co/docs/api/doc/elasticsearch/endpoint/synonyms.get_synonyms) | Lists all synonym sets. |
+| [Get synonym sets](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-synonyms-get-synonyms-sets) | Lists all synonym sets. |
 
 ### [Task management](https://www.elastic.co/docs/api/doc/elasticsearch/v9/group/endpoint-tasks)