Error in Checking OpenSearch Service for data

Hello,

I checked the sample code which is available in the document you are following. I can see that code only contains POST API defined for OpenSearch domain and when you trying to search the data its sending a GET request which is not defined in the handler. Hence you are receiving the error "no handler found for uri [/lambda-s3-index/lambda-type/_search] and method [GET]".

Code snippet from document you are following:

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
    }

Next Steps:

In order to mitigate the issue, I will suggest to update your Lambda code and add GET API code in your Lambda handler[1][2] or use POST to send search requests to your Lambda function[3] which will allow you to search data from your OpenSearch domain.

Following documents contain reference codes and you can make changes accordingly in your Lambda function as per your use case:

[1] Tutorial: Creating a search application with Amazon OpenSearch Service - Create the Lambda function - https://docs.aws.amazon.com/opensearch-service/latest/developerguide/search-example.html#sample-lamdba-python

[2] Signing HTTP requests to Amazon OpenSearch Service - Python - https://docs.aws.amazon.com/opensearch-service/latest/developerguide/request-signing.html#request-signing-python

[3] Searching data in Amazon OpenSearch Service - Request body searches - https://docs.aws.amazon.com/opensearch-service/latest/developerguide/searching.html#searching-dsl