Add search terms to arg dataframe commands (#6724)

* added search terms for arg prefixed dataframe commands

* remove search terms that already produce results

crates/nu-command/src/dataframe/series/arg_max.rs

@@ -19,6 +19,10 @@ impl Command for ArgMax {
         "Return index for max value in series"
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["argmax", "maximum", "most", "largest", "greatest"]
+    }
+
     fn signature(&self) -> Signature {
         Signature::build(self.name())
             .input_type(Type::Custom("dataframe".into()))

crates/nu-command/src/dataframe/series/arg_min.rs

@@ -19,6 +19,10 @@ impl Command for ArgMin {
         "Return index for min value in series"
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["argmin", "minimum", "least", "smallest", "lowest"]
+    }
+
     fn signature(&self) -> Signature {
         Signature::build(self.name())
             .input_type(Type::Custom("dataframe".into()))

crates/nu-command/src/dataframe/series/indexes/arg_sort.rs

@@ -19,6 +19,10 @@ impl Command for ArgSort {
         "Returns indexes for a sorted series"
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["argsort", "order", "arrange"]
+    }
+
     fn signature(&self) -> Signature {
         Signature::build(self.name())
             .switch("reverse", "reverse order", Some('r'))

crates/nu-command/src/dataframe/series/indexes/arg_true.rs

@@ -19,6 +19,10 @@ impl Command for ArgTrue {
         "Returns indexes where values are true"
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["argtrue", "truth", "boolean-true"]
+    }
+
     fn signature(&self) -> Signature {
         Signature::build(self.name())
             .input_type(Type::Custom("dataframe".into()))

crates/nu-command/src/dataframe/series/indexes/arg_unique.rs

@@ -19,6 +19,10 @@ impl Command for ArgUnique {
         "Returns indexes for unique values"
     }
 
+    fn search_terms(&self) -> Vec<&str> {
+        vec!["argunique", "distinct", "noduplicate", "unrepeated"]
+    }
+
     fn signature(&self) -> Signature {
         Signature::build(self.name())
             .input_type(Type::Custom("dataframe".into()))