Is there any problem in my elasticsearch request? - elasticsearch

Question

I'm trying to update a doc in elasticsearch by using:
POST /rcqmkg_eco_ugc_rec/_doc/aaa/_update
{
"script": {
"source": "ctx._source.flower_cnt_0 += params.flower_cnt_0",
"lang": "painless",
"params": {
"flower_cnt_0": 1
}
}
}
But I got a illegal_argument_exception error. The result of elasticsearch is:
{
"error": {
"root_cause": [
{
"type": "remote_transport_exception",
"reason": "[data1_xxx][xxx][indices:data/write/update[s]]"
}
],
"type": "illegal_argument_exception",
"reason": "failed to execute script",
"caused_by": {
"type": "script_exception",
"reason": "runtime error",
"script_stack": [
"ctx._source.flower_cnt_0 += params.flower_cnt_0",
" ^---- HERE"
],
"script": "ctx._source.flower_cnt_0 += params.flower_cnt_0",
"lang": "painless",
"caused_by": {
"type": "null_pointer_exception",
"reason": null
}
}
},
"status": 400
}
Where is the problem in my update request of es?

Answer 1

If the document you're trying to update might not contain a field called flower_cnt_0, you need to account for this in your script:
Try this instead:
POST /rcqmkg_eco_ugc_rec/_doc/aaa/_update
{
"script": {
"source": "ctx._source.flower_cnt_0 = (ctx._source.flower_cnt_0 ?: 0) + params.flower_cnt_0",
"lang": "painless",
"params": {
"flower_cnt_0": 1
}
}
}