add sort support to search, add index fields command, fix error messages (#25)

cmd/index.go

@@ -42,6 +42,7 @@ func Index(conf *cfg.Config) *cli.Command {
 			IndexAllocation(conf),
 			IndexModify(conf),
 			IndexAlias(conf),
+			IndexFields(conf),
 		},
 	}
 }
@@ -157,6 +158,8 @@ func IndexCreate(conf *cfg.Config) *cli.Command {
 		Name:    "create",
 		Aliases: []string{"+"},
 		Usage:   "create a new index",
+		UsageText: `create <name> <fieldmapping:type>...
+Valid field mapping types: integer, text, date, keyword`,
 
 		Flags: []cli.Flag{
 			&cli.BoolFlag{
@@ -250,3 +253,20 @@ func IndexModify(conf *cfg.Config) *cli.Command {
 		},
 	}
 }
+
+func IndexFields(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:      "fields",
+		Usage:     "show info about field capabilities",
+		UsageText: "index fields <index>",
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			index := cmd.Args().Get(0)
+			if index == "" {
+				return errors.New("no index specified")
+			}
+
+			return es.IndexFields(conf, index)
+		},
+	}
+}