In an elasticsearch instance, I have data in an index "a". I want to copy all data within a period (say Aug 2021 to September 2021) to another index "b". I apply reindex in the following manner:
POST _reindex
{
"source": {
"index": "a",
"query": {
"range": {
"created": {
"gte": "2021-08-01 00:00:00.000",
"lt": "2021-09-01 00:00:00.000"
}
}
}
},
"dest": {
"index": "b"
}
}
Now, if I decide to delete the index "b", what happens to the data that I just moved? Does it still stay in index "a"?
>Solution :
Yes, the reindex operation leaves the source index untouched. After the reindex is done, you have two indexes a and b and you can decide to do whatever you want with them.
If you’re happy with the data in index b you can decide to remove index a, if you’re not, you can delete b, keep a and re-attempt another reindex.
It’s up to you to do whatever you want.