Adding an integer value with the existing _id while doing reindex

Elastic Stack Elasticsearch
1

HI,

I would like to reindex with following scenario:
/source/type/1 to /destination/type/ ((1<<56) + _id). So if the _id in source index is _id=10 then at destination index same document should be at 72057594037927940 (calculated by 1<<56 = 72057594037927936 + ( source index _id)) . I tried with
"script": {
"source": "ctx._id = 'append' + ctx._id" } (where append is 1<<56 ) but it is concatenating the "72057594037927936" and "10" and creating the document at destination index at id 7205759403792793610. Please help me

2

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