Cannot instantiate interface Magento\Elasticsearch\Model\Adapter\FieldMapper\Product\FieldProvider\FieldName\ResolverInterface
closed as unclear what you're asking by Sumit, Rakesh Donga, Shoaib Munir, Jai, Muhammad Hasham Nov 8 at 6:59
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Did you do setup compile? Please run setup compile.
php bin/magento s:s:d
The elasticsearch php library wasn’t installed in Magento 2.
This issue is possible only if Elastic Search Ultimate was installed without using composer (manual installation). And not all steps from user manual were completed.
composer require elasticsearch/elasticsearch:~5.1
This command will install elasticsearch php library (for ES 5.1/6.2) and additional required libraries.