Getting error with partial update in SOLR7

Our application built with C# and SOLR search.

One of my requirement to implement partial updates with SOLR.I am getting an error while posting JSON data into SOLR server.

Error Response from SOLR API:

{
    "responseHeader": {
        "status": 400,
        "QTime": 30
    },
    "error": {
        "metadata": [
            "error-class",
            "org.apache.solr.common.SolrException",
            "root-error-class",
            "org.apache.solr.common.SolrException"
        ],
        "msg": "Atomic document updates are not supported unless <updateLog/> is configured",
        "code": 400
    }
}

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