Zend certified PHP/Magento developer

magento 2 : reindex display Unknown 503 error from Elasticsearch null

when i reindex this errore show

Design Config Grid index has been rebuilt successfully in 00:00:00
Customer Grid index has been rebuilt successfully in 00:00:00
Category Products index has been rebuilt successfully in 00:00:00
Product Categories index has been rebuilt successfully in 00:00:00
Catalog Rule Product index has been rebuilt successfully in 00:00:00
Product EAV index has been rebuilt successfully in 00:00:00
Stock index has been rebuilt successfully in 00:00:00
Inventory index has been rebuilt successfully in 00:00:00
Catalog Product Rule index has been rebuilt successfully in 00:00:00
Product Price index has been rebuilt successfully in 00:00:00
Catalog Search index process error during indexation process:
Unknown 503 error from Elasticsearch null

test elasticsearch

[neil@194-31-194-14 www]$ curl -XGET http://127.0.0.1:9200/
{
“name” : “194-31-194-14.cprapid.com”,
“cluster_name” : “elasticsearch”,
“cluster_uuid” : “na“,
“version” : {
“number” : “7.17.1”,
“build_flavor” : “default”,
“build_type” : “rpm”,
“build_hash” : “e5acb99f263322d62d6444ce45a4543dc1c8059a”,
>”build_date” : “2022-02-23T22:20:54.153567231Z”,
>”build_snapshot” : false,
“lucene_version” : “8.11.1”,
>”minimum_wire_compatibility_version” : “6.8.0”,
“minimum_index_compatibility_version” : “6.0.0-beta1”
},
“tagline” : “You Know, for Search”
}