lambda function always timing out when connecting to AWS Elasticsearch

The thing was error wasn't actualy in Elasticsearch part. My s3 access code and elasticsearch access code were tied up. Initially, s3 part was running fine due to lambda having default access to internet. However when i introduced elasticsearch, i put my lambda in vpc. During this time, I forgot that s3 code lost access to s3 storage. So when i ran the code and it was timing out, I assumed it was due to Elasticsearch. After hours of digging, I realized my error. The solution was to create Vpc endpoint for s3 service in that region and put it in the route table. elasticsearch was running fine.