The environment background is docker DNMP installation of ES + PHP

Corresponding docker compose configuration and corresponding port

Port 9200 can also be accessed normally

Code

Then 500 errors are reported, including:

 PHP Fatal error:  Uncaught Elasticsearch\Common\Exceptions\NoNodesAvailableException: No alive nodes found in your cluster in /www/localhost/vendor/elasticsearch/elasticsearch/src/Elasticsearch/ConnectionPool/StaticNoPingConnectionPool.php:67
Stack trace:
#0 /www/localhost/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(87): Elasticsearch\ConnectionPool\StaticNoPingConnectionPool->nextConnection()
#1 /www/localhost/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Transport.php(105): Elasticsearch\Transport->getConnection()
#2 /www/localhost/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php(275): Elasticsearch\Transport->performRequest('POST', '/my_index/my_ty...', Array, '{"testField":"a...', Array)
#3 /www/localhost/vendor/react/promise/src/FulfilledPromise.php(28): Elasticsearch\Connections\Connection->Elasticsearch\Connections\{closure}(Array)
#4 /www/localhost/vendor/ezimuel/ringphp/src/Future/CompletedFutureValue.php(55): React\Promise\FulfilledPromise->then(Object(Clos in /www/localhost/vendor/elasticsearch/elasticsearch/src/Elasticsearch/ConnectionPool/StaticNoPingConnectionPool.php on line 67

The reason is that the node cannot be found. The solution is as follows: find your own IP and specify the IP

Then the execution is OK