title: "[circuit_breaking_exception] [parent]" Data too large, data for "[<http_request>]" would be error
body: <p>After smoothly working for more than 10 months, I start getting this error on production suddenly while doing simple search queries.</p>
  
  <pre><code>{
    "error" : {
      "root_cause" : [
        {
          "type" : "circuit_breaking_exception",
          "reason" : "[parent] Data too large, data for [&lt;http_request&gt;] would be [745522124/710.9mb], which is larger than the limit of [745517875/710.9mb]",
          "bytes_wanted" : 745522124,
          "bytes_limit" : 745517875
        }
      ],
      "type" : "circuit_breaking_exception",
      "reason" : "[parent] Data too large, data for [&lt;http_request&gt;] would be [745522124/710.9mb], which is larger than the limit of [745517875/710.9mb]",
      "bytes_wanted" : 745522124,
      "bytes_limit" : 745517875
    },
    "status" : 503
  }
  </code></pre>
  
  <p>Initially, I was getting this error while doing simple term queries when I got this <strong>circuit_breaking_exception</strong> error, To debug this I tried _cat/health query on elasticsearch cluster, but still, the same error, even the simplest query <strong>localhost:9200</strong> is giving the same error Not sure what happens to the cluster suddenly.
  Her is my circuit breaker status:</p>
  
  <pre><code>"breakers" : {
          "request" : {
            "limit_size_in_bytes" : 639015321,
            "limit_size" : "609.4mb",
            "estimated_size_in_bytes" : 0,
            "estimated_size" : "0b",
            "overhead" : 1.0,
            "tripped" : 0
          },
          "fielddata" : {
            "limit_size_in_bytes" : 639015321,
            "limit_size" : "609.4mb",
            "estimated_size_in_bytes" : 406826332,
            "estimated_size" : "387.9mb",
            "overhead" : 1.03,
            "tripped" : 0
          },
          "in_flight_requests" : {
            "limit_size_in_bytes" : 1065025536,
            "limit_size" : "1015.6mb",
            "estimated_size_in_bytes" : 560,
            "estimated_size" : "560b",
            "overhead" : 1.0,
            "tripped" : 0
          },
          "accounting" : {
            "limit_size_in_bytes" : 1065025536,
            "limit_size" : "1015.6mb",
            "estimated_size_in_bytes" : 146387859,
            "estimated_size" : "139.6mb",
            "overhead" : 1.0,
            "tripped" : 0
          },
          "parent" : {
            "limit_size_in_bytes" : 745517875,
            "limit_size" : "710.9mb",
            "estimated_size_in_bytes" : 553214751,
            "estimated_size" : "527.5mb",
            "overhead" : 1.0,
            "tripped" : 0
          }
        }
  </code></pre>
  
  <p>I found a similar issue here<a href="https://github.com/elastic/elasticsearch/issues/31197" rel="noreferrer">Github Issue</a> that suggests increasing circuit breaker memory or disabling the same. But I am not sure what to choose. Please help!</p>
  
  <p>Elasticsearch Version 6.3</p>