I am new with Elasticsearch, So this could be know for you.
I have integrated the Elasticsearch with Magento2, And the Indexing is done beautifully, But I again tried 2nd time to reindex, it does not succeed. Here is the error message which I am getting:
Catalog Search indexer process unknown error: illegal_argument_exception: Illegal dynamic template parameter: [match_mapping]
And also when I try to search products from Magento Store, it does not give any result. Strang but facing this issue.
Help me guys to solve this problem.