Calling opensearch service via lambda, but reqest not getting posted - amazon-web-services

Question

Posting data on opensearch service via lambda, but when I am going to opensearch service Endpoint URL to check getting below error.
{
"error" : "no handler found for uri [/lambda-s3-index/lambda-type/_search] and method [GET]"
}
Tried printing the response while posting, getting 400. below is the code
import boto3
import requests
from requests_aws4auth import AWS4Auth
import os
import json
import datetime
region = 'us-east-1'
service = 'es'
credentials = boto3.Session().get_credentials()
awsauth = AWS4Auth(credentials.access_key, credentials.secret_key, region, service, session_token=credentials.token)
index = 'lambda-s3-index'
type = 'lambda-type'
host = os.environ['ES_DOMAIN_URL']
url = host + '/' + index + '/' + type
headers = { "Content-Type": "application/json" }
s3 = boto3.client('s3')
bucket = os.environ['S3_BUCKET']
# Lambda execution starts here
def handler(event, context):
sensorID = event['sensorID']
timestamp = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
temperature = event['temperature']
document = { "sensorID": sensorID, "timestamp": timestamp, "temperature": temperature }
print(document)
# post to S3 for storage
s3.put_object(Body=json.dumps(document).encode(), Bucket=bucket, Key=sensorID+"-"+timestamp+".json")
# post to amazon elastic search for indexing and kibana use
r = requests.post(url, auth=awsauth, json=document, headers=headers)
print(r)
response = "Data Uploaded"
return {
"Response" : response,
"sensorID" : sensorID,
"temperature": temperature
}