### Is there an existing issue for this?

- [X] I have searched the existing issues

### Feature description

Basically we want to only run the lambda when an insert is occurring in DynamoDB.
I tested using Dynobase deleting a record and the lambda still triggered.

```
resource "aws_lambda_event_source_mapping" "event-log" {
	event_source_arn  = aws_dynamodb_table.event-log.stream_arn
	function_name     = module.main.lambda-arn
	starting_position = "LATEST"
	enabled = true # change to false when truncating the table in localstack
	maximum_retry_attempts = 1 # limit retry on failure to 1 for now

	# https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
	filter_criteria { # Doesn't seem to work on LocalStack for now
		filter {
			pattern = jsonencode({
				body = {
					eventName : ["INSERT"]
				}
			})
		}
	}
}
```


### 🧑‍💻 Implementation

_No response_

### Anything else?

 https://dev.to/aws-builders/filtering-dynamodb-streams-before-lambda-p5p
def _wait_for_cluster(domain_name: str):
        def finished_processing():
            status = opensearch_client.describe_domain(DomainName=domain_name)["DomainStatus"]
            return status["Processing"] is False
        assert poll_condition(
            finished_processing, timeout=5 * 60
        ), f"could not start domain: {domain_name}"
    return _wait_for_cluster
@pytest.fixture
def opensearch_create_domain(opensearch_client, opensearch_wait_for_cluster):
    domains = []
    def factory(**kwargs) -> str:
        if "DomainName" not in kwargs:
            kwargs["DomainName"] = f"test-domain-{short_uid()}"
        opensearch_client.create_domain(**kwargs)
        opensearch_wait_for_cluster(domain_name=kwargs["DomainName"])
        domains.append(kwargs["DomainName"])
        return kwargs["DomainName"]
    yield factory
    
    for domain in domains:
        try:
            opensearch_client.delete_domain(DomainName=domain)
        except Exception as e:
            LOG.debug("error cleaning up domain %s: %s", domain, e)
@pytest.fixture
def opensearch_domain(opensearch_create_domain) -> str: