# How to fix index\_out\_of\_bounds\_exception exception in aggregation in painless script
**URL:** https://discuss.elastic.co/t/how-to-fix-index-out-of-bounds-exception-exception-in-aggregation-in-painless-script/144787
**Category:** Elasticsearch
**Created:** [August 16, 2018, 9:54pm UTC](https://discuss.elastic.co/t/how-to-fix-index-out-of-bounds-exception-exception-in-aggregation-in-painless-script/144787 "2018-08-16T21:54:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Steven\_Ensslen](https://discuss.elastic.co/u/Steven_Ensslen)
#### Post date: [August 16, 2018, 9:54pm UTC](https://discuss.elastic.co/t/how-to-fix-index-out-of-bounds-exception-exception-in-aggregation-in-painless-script/144787/1 "2018-08-16T21:54:50Z")
I have what I believe to be an entirely normal index where 1% of the documents don't have a field present. I'd like to write a painless script that references that field, but whenever I do I get "Courier fetch: X of Y shards failed."
The response reads:
`"reason": { "type": "script_exception", "reason": "runtime error", "script_stack": ["java.nio.Buffer.checkIndex(Buffer.java:540)", "java.nio.DirectByteBuffer.get(DirectByteBuffer.java:253)", "org.apache.lucene.store.ByteBufferGuard.getByte(ByteBufferGuard.java:118)", "org.apache.lucene.store.ByteBufferIndexInput$SingleBufferImpl.readByte(ByteBufferIndexInput.java:385)", "org.apache.lucene.util.packed.DirectReader$DirectPackedReader1.get(DirectReader.java:86)", "org.apache.lucene.codecs.lucene70.Lucene70DocValuesProducer$19.ordValue(Lucene70DocValuesProducer.java:865)", "org.apache.lucene.index.SingletonSortedSetDocValues.advanceExact(SingletonSortedSetDocValues.java:83)", "org.elasticsearch.index.fielddata.FieldData$10.advanceExact(FieldData.java:377)", "org.elasticsearch.index.fielddata.ScriptDocValues$BinaryScriptDocValues.setNextDocId(ScriptDocValues.java:588)", "org.elasticsearch.index.fielddata.ScriptDocValues$Strings.setNextDocId(ScriptDocValues.java:623)", "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:94)", "org.elasticsearch.search.lookup.LeafDocLookup.get(LeafDocLookup.java:39)", "if (doc[fieldname] != null) {", " ^---- HERE" ], "script": "String safeGet(def doc, String fieldname) { if (doc[fieldname] != null) {return doc[fieldname].value;} else {return ' ';} } return safeGet(doc,'portal') + ' ' + safeGet(doc,'event')", "lang": "painless", "caused_by": { "type": "index_out_of_bounds_exception", "reason": null }`
I've also tried `contains_key()` and `.size() > 0` checks, neither of which worked for me.
I am using a JSON input field in a visualization in [Elastic.co](http://Elastic.co) hosted Kibana 6.3.1 .
I am aware that this question has been asked here [many](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012) [times](https://discuss.elastic.co/t/how-to-check-a-doc-field-exist-while-creating-scripted-field-using-painless/74355) [before](https://discuss.elastic.co/t/how-to-check-for-existence-of-field-in-script/3815). I don't believe that any of those questions were answered to the satisfaction of the questioner, and I have tried all of the proposed "solutions", all of which return the same error.
---
### Author:  [@Steven\_Ensslen](https://discuss.elastic.co/u/Steven_Ensslen)
#### Post date: [August 16, 2018, 11:17pm UTC](https://discuss.elastic.co/t/how-to-fix-index-out-of-bounds-exception-exception-in-aggregation-in-painless-script/144787/2 "2018-08-16T23:17:57Z")
On closer examination, this same error also occurs for fields that always exist.
The query Kibana is sending to elasticsearch is:
{
"size": 0,
"\_source": {
"excludes": []
},
"aggs": {
"2": {
"date\_histogram": {
"field": "relevant\_at",
"interval": "1d",
"time\_zone": "Pacific/Auckland",
"min\_doc\_count": 1
},
"aggs": {
"3": {
"terms": {
"field": "ticket\_group\_name",
"size": 5,
"order": {
"\_count": "desc"
},
"script": "doc['ticket\_group\_name'].value + ' ' + doc['ticket\_type\_name'].value;"
}
}
}
}
},
"stored\_fields": [
"\*"
],
"script\_fields": {},
"docvalue\_fields": [
"@timestamp",
"identity\_extra.from\_re",
"purchased\_on",
"relevant\_at",
"start\_datetime"
],
"query": {
"bool": {
"must": [
{
"range": {
"relevant\_at": {
"gte": 1533856413951,
"lte": 1534461213951,
"format": "epoch\_millis"
}
}
}
],
"filter": [
{
"match\_all": {}
}
],
"should": [],
"must\_not": []
}
}
}
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [September 13, 2018, 11:18pm UTC](https://discuss.elastic.co/t/how-to-fix-index-out-of-bounds-exception-exception-in-aggregation-in-painless-script/144787/3 "2018-09-13T23:18:07Z")
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