Index Not found Exception

[waqarRns]

ResponseError: index_not_found_exception: [index_not_found_exception] Reason: no such index [article].

on stapi startup strapi-elastic is unable to create indexes in the elastic search.

here is the Exception:
ResponseError: index_not_found_exception: [index_not_found_exception] Reason: no such index [article]
{
meta: {
body: { error: [Object], status: 404 },
statusCode: 404,
headers: {
'x-elastic-product': 'Elasticsearch',
'content-type': 'application/json;charset=utf-8',
'content-length': '371'
},
meta: {
context: null,
request: [Object],
name: 'elasticsearch-js',
connection: [Object],
attempts: 0,
aborted: false
},
warnings: [Getter]
}
}