# create data stream
PUT _data_stream/logs-test-abc

# add mappings
PUT _data_stream/logs-test-abc/_mappings
{
    "properties": {
        "x": {
            "type": "keyword"
        }
    }
}

# simulate the index - x is not there
POST _index_template/_simulate_index/logs-test-abc

# actually rollover the index
POST logs-test-abc/_rollover

# x is mapped as expected in the new write index
GET logs-test-abc