Elastic Search issue with Magento 2.3.0

I have installed Elasticsearch and it’s showing below message when I run this command
curl -X GET ‘http://localhost:9200‘

{
  "name" : "a_KnAuZ",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "S-RwARt0SZGKMjYHqIuu5g",
  "version" : {
    "number" : "6.1.1",
    "build_hash" : "bd92e7f",
    "build_date" : "2017-12-17T20:23:25.338Z",
    "build_snapshot" : false,
    "lucene_version" : "7.1.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

Also, it’s showing https://prnt.sc/rz8hio connection success message but when I am running index management command then it’s showing below error message for catalogsearch_fulltext

{"error":{"root_cause":[{"type":"invalid_alias_name_exception","reason":"Invalid alias name [magento2_product_1], an index exists with thesame name as the alias","index_uuid":"MPr9O_RGTDKbDx4j4c8whg","index":"magento2_product_1"}],"type":"invalid_alias_name_exception","reason":"Invalid alias name [magento2_product_1], an index exists with the same name as the alias","index_uuid":"MPr9O_RGTDKbDx4j4c8whg","index":"magento2_product_1"},"status":400} 

I am using Magento version 2.3.0 Version, how can we solve this issue?