Step 1
I installed Elasticsearch 8.5 to the C:\server\elasticsearch\8.5.3 folder and registered it as a Windows service.
Follow the article How do I install Elasticsearch 8.5 to Windows?
Step 2
I installed Elasticsearch 7 to an adjacent folder (C:\server\elasticsearch\7.17.6).
Follow the steps 1, 2, 4 from the article How do I install Elasticsearch 7.17.6 to Windows?
Step 3
I wrote at the begiinning of the C:\server\elasticsearch\7.17.6\bin\elasticsearch.bat file:
set ES_HOME=C:\server\elasticsearch\7.17.6\
set ES_PATH_CONF=config
Step 4
I wrote to C:\server\elasticsearch\7.17.6\config\elasticsearch.yml:
bootstrap.memory_lock: false
cluster.name: elasticsearch
http.port: 9201
indices.id_field_data.enabled: true
node.data: true
node.ingest: true
node.master: true
node.max_local_storage_nodes: 1
node.name: DMITRII
path.data: E:\server\elasticsearch\7.17.6
path.logs: C:\server\log\elasticsearch-7.17.6
transport.tcp.port: 9301
xpack.license.self_generated.type: basic
xpack.security.enabled: false
Step 5
bin/magento config:set catalog/search/elasticsearch7_server_port 9201
bin/magento cache:clean
bin/magento indexer:reindex && bin/magento cache:clean
Step 6
cd C:\server\elasticsearch\7.17.6
.\bin\elasticsearch.bat