elasticsearch diff between must and should

OR is spelled should AND is spelled must NOR is spelled should_not Example: You want to see all the items that are (round AND (red OR blue)): { "query": { "bool": { "must": [ { "term": {"shape": "round"} }, { "bool": { "should": [ {"term": {"color": "red"}}, {"term": {"color": "blue"}} ] } } ] } } }

This is how you can nest multiple bool queries in one outer bool query this using Kibana,

bool indicates we are using boolean
must is for AND
should is for OR

GET my_inedx/my_type/_search
{
  "query" : {
     "bool": {             //bool indicates we are using boolean operator
          "must" : [       //must is for **AND**
               {
                 "match" : {
                       "description" : "some text"  
                   }
               },
               {
                  "match" :{
                        "type" : "some Type"
                   }
               },
               {
                  "bool" : {          //here its a nested boolean query
                        "should" : [  //should is for **OR**
                               {
                                 "match" : {
                                     //ur query
                                }
                               },
                               { 
                                  "match" : {} 
                               }     
                             ]
                        }
               }
           ]
      }
  }
}

This is how you can nest a query in ES

There are more types in "bool" like,

Filter
must_not

Posted by: Guest on October-15-2021

By the definition, SHOULD is like an OR and without a MUST clause it implies 'at least' one should match. must means: Clauses that must match for the document to be included. should means: If these clauses match, they increase the _score; otherwise, they have no effect. They are simply used to refine the relevance score for each document. Yes you can use multiple filters inside must

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