# Ctx.payload.hits NOT working error **URL:** \ **Category:** Elasticsearch\ **Tags:** elastic-stack-monitoring, painless\ **Created:** [July 30, 2021, 10:53am UTC](https://discuss.elastic.co/t/ctx-payload-hits-not-working-error/280070 "2021-07-30T10:53:14Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![alex14](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@alex14](https://discuss.elastic.co/u/alex14)\ **Post date:** [July 30, 2021, 10:53am UTC](https://discuss.elastic.co/t/ctx-payload-hits-not-working-error/280070/1 "2021-07-30T10:53:14Z")
hey there, I´m trying to create a watcher but i need to use some fields from my index to send that information via email but i always get the same error "caused\_by": { "type": "null\_pointer\_exception", "reason": "Cannot invoke "Object.getClass()" because "callArgs[0]" is null" This is my watcher { "trigger": { "schedule": { "interval": "1m" } }, "input": { "search": { "request": { "search\_type": "query\_then\_fetch", "indices": [ ".monitoring-es-\*" ], "rest\_total\_hits\_as\_int": true, "body": { "size": 0, "query": { "bool": { "must": [ { "range": { "timestamp": { "gte": "{{ctx.trigger.scheduled\_time}}||-5m", "lte": "{{ctx.trigger.scheduled\_time}}", "format": "strict\_date\_optional\_time||epoch\_millis" } } }, { "exists": { "field": "node\_stats" } } ] } }, "aggs": { "metricAgg": { "max": { "field": "node\_stats.jvm.mem.heap\_used\_percent" } } } } } } }, "condition": { "script": { "source": "if (ctx.payload.aggregations.metricAgg.value \> params.threshold) { return true; } return false;", "lang": "painless", "params": { "threshold": 69 } } }, "actions": { "email\_action": { "transform": { "script": { "source": "['items': ctx.payload.hits.collect(hit -\> ['HostName': hit.\_source.service.address, 'NodeName': hit.\_source.agent.hostname, 'Address': hit.\_source.source\_code.transport\_address, 'index': hit.\_index])]", "lang": "painless" } }, "email": { "profile": "standard", "to": [ "[ander.o@example.com](mailto:ander.o@example.com)" ], "subject": "[{{ctx.metadata.name}}] node Heap: ({{ctx.payload.result}}%) \> 85%", "body": { "html": """ # Monitoring Cluster The Alarm [{{ctx.metadata.name}}], detected excedeed 85% Heap usage of {{ctx.payload.result}} in the node {{NodeName}}, ``` {{NodeName}} {{HostName}} {{Address}} {{ctx.payload.aggregations.metricAgg.value}}

""" } } } ``` }, "transform": { "script": { "source": "HashMap result = new HashMap(); result.result = ctx.payload.aggregations.metricAgg.value; return result;", "lang": "painless", "params": { "threshold": 69 } } } } this is part of the index "hits" : [ { "\_index" : ".monitoring", "\_type" : "\_doc", "\_id" : "IUHjJKJKJGvuyvytyiuhiuhuiho", "\_score" : 0.0, "\_source" : { "@timestamp" : "2020-06-30T06:44:22.897Z", "type" : "node\_stats", "event" : { "module" : "elasticsearch", }, "service" : { "address" : "xxxxxx", "type" : "elasticsearch" }, "agent" : { "name" : "XXXX", , "timestamp" : "2020-06-30T06:44:22.904Z", "source\_node" : { "transport\_address" : "192.128.1.0.0.0", "name" : "master" }, "ecs" : { "version" : "1.7.0" }, "id" : "3a81894984917881189", "name" : "xxxx", "hostname" : "xxxxx", }, "node\_stats" : { "process" : { "cpu" : { "percent" : 0 }, "node\_master" : true, "jvm" : { "mem" : { "heap\_used\_in\_bytes" : 20273711512, "heap\_used\_percent" : 60, "heap\_max\_in\_bytes" : 33285996544 } and the error is alway about "caused\_by": { "type": "null\_pointer\_exception", "reason": "Cannot invoke "Object.getClass()" because "callArgs[0]" is null" } } }, "reason": "Failed to transform payload" here you have the error complete { "watch\_id": "XXXXXXb", "node": "XXXXX", "state": "executed", "user": "elastic", "status": { "state": { "active": true, "timestamp": "2021-07-30T10:46:25.268Z" }, "last\_checked": "2021-07-30T10:48:04.151Z", "last\_met\_condition": "2021-07-30T10:48:04.151Z", "actions": { "email\_action": { "ack": { "timestamp": "2020-07-30T10:46:25.268Z", "state": "awaits\_successful\_execution" }, "last\_execution": { "timestamp": "2021-07-30T10:48:04.151Z", "successful": false, "reason": "Failed to transform payload" } } }, "execution\_state": "executed", "version": -1 }, "trigger\_event": { "type": "schedule", "triggered\_time": "2021-07-30T10:48:04.151Z", "schedule": { "scheduled\_time": "2021-07-30T10:48:04.102Z" } }, "input": { "search": { "request": { "search\_type": "query\_then\_fetch", "indices": [ ".monitoring-es-_" ], "rest\_total\_hits\_as\_int": true, "body": { "size": 0, "query": { "bool": { "must": [ { "range": { "timestamp": { "gte": "{{ctx.trigger.scheduled\_time}}||-5m", "lte": "{{ctx.trigger.scheduled\_time}}", "format": "strict\_date\_optional\_time||epoch\_millis" } } }, { "exists": { "field": "node\_stats" } } ] } }, "aggs": { "metricAgg": { "max": { "field": "node\_stats.jvm.mem.heap\_used\_percent" } } } } } } }, "condition": { "script": { "source": "if (ctx.payload.aggregations.metricAgg.value \> params.threshold) { return true; } return false;", "lang": "painless", "params": { "threshold": 69 } } }, "metadata": { "name": "monitoring-es-jvm-PERCENT", "xpack": { "type": "json" } }, "result": { "execution\_time": "2021-07-30T10:48:04.151Z", "execution\_duration": 304, "input": { "type": "search", "status": "success", "payload": { "\_shards": { "total": 8, "failed": 0, "successful": 8, "skipped": 0 }, "hits": { "hits": [], "total": 275, "max\_score": null }, "took": 302, "timed\_out": false, "aggregations": { "metricAgg": { "value": 71 } } }, "search": { "request": { "search\_type": "query\_then\_fetch", "indices": [ ".monitoring-es-_" ], "rest\_total\_hits\_as\_int": true, "body": { "size": 0, "query": { "bool": { "must": [ { "range": { "timestamp": { "gte": "2021-07-30T10:48:04.102Z||-5m", "lte": "2021-07-30T10:48:04.102Z", "format": "strict\_date\_optional\_time||epoch\_millis" } } }, { "exists": { "field": "node\_stats" } } ] } }, "aggs": { "metricAgg": { "max": { "field": "node\_stats.jvm.mem.heap\_used\_percent" } } } } } } }, "condition": { "type": "script", "status": "success", "met": true }, "transform": { "type": "script", "status": "success", "payload": { "result": 71 } }, "actions": [ { "id": "email\_action", "type": "email", "status": "failure", "transform": { "type": "script", "status": "failure", "reason": "runtime error", "error": { "root\_cause": [ { "type": "script\_exception", "reason": "runtime error", "script\_stack": [ "hit -\> ['HostName': hit.\_source.service.address, 'NodeName': hit.\_source.agent.hostname, 'Address': hit.\_source.source\_code.transport\_address, 'index': hit.\_index])]", "^---- HERE" ], "script": "['items': ctx.payload.hits.collect(hit -\> ['HostName': hit.\_source.service.address, 'NodeName': hit.\_source.agent.hostname, 'Address': hit.\_source.source\_code.transport\_address, 'index': hit.\_index])]", "lang": "painless", "position": { "offset": 35, "start": 35, "end": 200 } } ], "type": "script\_exception", "reason": "runtime error", "script\_stack": [ "hit -\> ['HostName': hit.\_source.service.address, 'NodeName': hit.\_source.agent.hostname, 'Address': hit.\_source.source\_code.transport\_address, 'index': hit.\_index])]", "^---- HERE" ], "script": "['items': ctx.payload.hits.collect(hit -\> ['HostName': hit.\_source.service.address, 'NodeName': hit.\_source.agent.hostname, 'Address': hit.\_source.source\_code.transport\_address, 'index': hit.\_index])]", "lang": "painless", "position": { "offset": 35, "start": 35, "end": 200 }, "caused\_by": { "type": "null\_pointer\_exception", "reason": "Cannot invoke "Object.getClass()" because "callArgs[0]" is null" } } }, "reason": "Failed to transform payload" } ] }, "messages": } | Node | Host Name | IP | % | | --- | --- | --- | --- | ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [August 1, 2021, 10:16pm UTC](https://discuss.elastic.co/t/ctx-payload-hits-not-working-error/280070/2 "2021-08-01T22:16:51Z")
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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [August 1, 2021, 10:16pm UTC](https://discuss.elastic.co/t/ctx-payload-hits-not-working-error/280070/3 "2021-08-01T22:16:55Z")