#set( $pageKey = $input.params('pageKey'))
{
  "TableName": "myTable",
  "IndexName":"OwnerIndex",
  "KeyConditionExpression": "#n_owner = :v_owner",
  "FilterExpression": "contains(#n_id, :v_searchString)",
  "ExpressionAttributeValues": {
    ":v_owner": {"S": "$context.authorizer.claims.email"},
    ":v_searchString":{"S":"$input.params().path.searchString"}
  },
  "ExpressionAttributeNames": {"#n_owner": "owner", "#n_id":"id"}
}