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can i use grouping to eliminate duplication on the returned values using REST API ?or is there any other way the remove\delete duplicated values using REST?
Use Search API trimduplicates
var searchApi='/_api/search/query?querytext=%27ContentType:"CT Name"
var searchQuery=_spPageContextInfo.siteAbsoluteUrl+searchApi+' %27'+selectedParameter;
Required, but never shown