[SOLR-15494] Unexisting feature store in list after feature extraction - ASF JIRA

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After I execute a feature extraction with a feature store that doesn't exist, it appears in the list of feature stores.

Here an example.

Before the feature extraction query:

{
"responseHeader":

{ "status": 0, "QTime": 0 }

,
    "featureStores": [
        "first_store",
        "second_store"
    ]
}

I then execute the feature extraction query with a store that doesn't exist:

[features store=*third_store* efi.first_feature=1 efi.second_feature=1]

Then the feature store list becomes:

{
"responseHeader":

{ "status": 0, "QTime": 0 }

,
    "featureStores": [
        "first_store",
        "second_store",
        "third_store"
    ]
}

After reloading the collection we return to see the correct feature stores:

{
"responseHeader":

{ "status": 0, "QTime": 0 }

,
    "featureStores": [
        "first_store",
        "second_store"
    ]
}

It seems like a temporarily empty store is created after the feature extraction request. This shouldn't happen.