Removed unused code; clean up error message

Signed-off-by: Asim Mahmood <[email protected]>

Author: asimmahmood1

server/src/main/java/org/opensearch/search/aggregations/metrics/CardinalityAggregationBuilder.java

@@ -157,24 +157,11 @@ public CardinalityAggregationBuilder precisionThreshold(long precisionThreshold)
         return this;
     }
 
-    /**
-     * Get the precision threshold. Higher values improve accuracy but also
-     * increase memory usage. Will return <code>null</code> if the
-     * precisionThreshold has not been set yet.
-     */
-    public Long precisionThreshold() {
-        return precisionThreshold;
-    }
-
     public CardinalityAggregationBuilder executionHint(String executionHint) {
         this.executionHint = executionHint;
         return this;
     }
 
-    public String executionHint() {
-        return executionHint;
-    }
-
     @Override
     protected CardinalityAggregatorFactory innerBuild(
         QueryShardContext queryShardContext,

server/src/main/java/org/opensearch/search/aggregations/metrics/CardinalityAggregatorFactory.java

@@ -69,7 +69,7 @@ public static ExecutionMode fromString(String value) {
             try {
                 return ExecutionMode.valueOf(value.toUpperCase(Locale.ROOT));
             } catch (IllegalArgumentException e) {
-                throw new IllegalArgumentException("Unknown `execution_hint`: [" + value + "], expected any of [direct, ordinals]");
+                throw new IllegalArgumentException("Unknown execution_hint: [" + value + "], expected any of [direct, ordinals]");
             }
         }