Why does split creates multiple output records in json filter

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1

I havea JSON with array element in it

{
   "K1": "V1",
    "k2":"v2",
    "k3": [{"a1":"b1","a2":"b2"},{"a1":"c1","a2":d2}]
}

After logstash filter, I saving this in Elastic search, but for single json record its inserting two records

Record -1
{
    "id":1,
    "K1": "V1",
    "k2":"v2",
    "a1":"b1",
    "a2":"b2" 
}

Record -2
{
   "id":2,
   "K1": "V1",
   "k2":"v2",
   "a1":"c1",
   "a2":"d2" 
}

Expected :

{
   "id":1,
   "K1": "V1",
   "k2":"v2",
   "a1.0":"b1",
    "a2.0":"b2" 
   "a1.1":"c1",
   "a2.1":"d2" 
}

I tried making key unique thinking this causing the issue, but still, it created two records. Fundamentally I want to understand what is causing two record creation, I assume its split filter. Please help me in understanding. I will share my config if required.

2

Hi,

That is the expected behavior of split filter, split the original document into several ones, so unfortunately is not useful for your use case.

I'm not 100% sure about your expected output, either new fields with the original + period "." + correlative index, like "a1.0" or an array of elements "a1" : [ "b1" , "c1" ].
¿Can you clarify this?

I think the most straightforward way to do it would be with a ruby filter with custom code to process the original array and create these fields.

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3

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