Fix typo in docs about Elasticsearch

changelogs/unreleased/40770-doc-elasticsearch.yml

+---
+title: Fix typo in docs about Elasticsearch
+merge_request: 15699
+author: Takuya Noguchi
+type: other

doc/development/changelog.md

@@ -80,7 +80,7 @@ changes.
 
 The first example focuses on _how_ we fixed something, not on _what_ it fixes.
 The rewritten version clearly describes the _end benefit_ to the user (fewer 500
-errors), and _when_ (searching commits with ElasticSearch).
+errors), and _when_ (searching commits with Elasticsearch).
 
 Use your best judgement and try to put yourself in the mindset of someone
 reading the compiled changelog. Does this entry add value? Does it offer context

doc/university/glossary/README.md

@@ -175,7 +175,7 @@ A [feature](https://docs.gitlab.com/ce/user/project/container_registry.html) of
 
 ### EC2 Instance
 
-### ElasticSearch
+### Elasticsearch
 
 Elasticsearch is a flexible, scalable and powerful search service. When [enabled](https://gitlab.com/help/integration/elasticsearch.md), it helps keep GitLab's search fast when dealing with a huge amount of data.