Update logging-features.md (#8795)

* Update logging-features.md

Add a link to hello-ltr demo for context about the index schema

Signed-off-by: Scott Stults <sstults@opensourceconnections.com>

* Update _search-plugins/ltr/logging-features.md

Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Signed-off-by: Scott Stults <sstults@opensourceconnections.com>

---------

Signed-off-by: Scott Stults <sstults@opensourceconnections.com>
Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
(cherry picked from commit b50a3eb)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

_search-plugins/ltr/logging-features.md

@@ -12,7 +12,7 @@ Feature values need to be logged in order to train a model. This is a crucial co
 
 ## `sltr` query
 
-The `sltr` query is the primary method for running features and evaluating models. When logging, an `sltr` query is used to execute each feature query and retrieve the feature scores. A feature set structure is shown in the following example request:
+The `sltr` query is the primary method for running features and evaluating models. When logging, an `sltr` query is used to execute each feature query and retrieve the feature scores. A feature set structure that works with the [`hello-ltr`](https://github.com/o19s/hello-ltr) demo schema is shown in the following example request:
 
 ```json
 PUT _ltr/_featureset/more_movie_features