Elasticsearch match nested field against array of values
I think you would need to change your mappings for your nested types for this - the terms query only works on not_analyzed fields. If you update your mapping to something like:
elasticsearch!({ prefix_name: false, index_name: 'documents', index_options: { mappings: { document: { properties: { procuring_entity: { type: 'nested', properties: { country: { 'type': 'string', 'index': 'not_analyzed' } } }, awards: { type: 'nested' } } } } }, wrapper: :load})I think the query should work if you do that.