Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v9.1.3

Author: elastic-renovate-prod[bot]

docs/reference/search-connectors/api-tutorial.md

@@ -44,7 +44,7 @@ docker run -p 9200:9200 -d --name elasticsearch \
   -e "xpack.security.enabled=false" \
   -e "xpack.security.http.ssl.enabled=false" \
   -e "xpack.license.self_generated.type=trial" \
-  docker.elastic.co/elasticsearch/elasticsearch:9.0.0
+  docker.elastic.co/elasticsearch/elasticsearch:9.1.3
 ```
 
 ::::{warning}

x-pack/qa/repository-old-versions-compatibility/src/javaRestTest/resources/README.md

@@ -35,10 +35,10 @@ docker run -d --name es \
 -v ${SHARED_FOLDER}/data:/usr/share/elasticsearch/data \
 -v ${SHARED_FOLDER}/snapshots:/usr/share/elasticsearch/snapshots \
 --env "discovery.type=single-node" \
-docker.elastic.co/elasticsearch/elasticsearch:5.6.16
+docker.elastic.co/elasticsearch/elasticsearch:9.1.3
 
 // Version 6
-docker.elastic.co/elasticsearch/elasticsearch:6.8.23
+docker.elastic.co/elasticsearch/elasticsearch:9.1.3
 ```
 
 ### Create Index Version 5