From b0b01941b80e9b01f5db28a44ba8989aae16ae0a Mon Sep 17 00:00:00 2001
From: Thomas von Dein <tom@vondein.org>
Date: Thu, 16 Jul 2026 23:15:13 +0200
Subject: [PATCH] add index copy (aka reindex)

---
 pkg/es/index_copy.go | 83 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 pkg/es/index_copy.go

diff --git a/pkg/es/index_copy.go b/pkg/es/index_copy.go
new file mode 100644
index 0000000..63c5db6
--- /dev/null
+++ b/pkg/es/index_copy.go
@@ -0,0 +1,83 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package es
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/printer"
+	"github.com/elastic/go-elasticsearch/v9/typedapi/esdsl"
+	"github.com/elastic/go-elasticsearch/v9/typedapi/types/enums/conflicts"
+)
+
+func IndexCopy(conf *cfg.Config) error {
+	copy := conf.DefaultCluster.ES().Reindex()
+
+	if conf.Force {
+		copy.Conflicts(conflicts.Proceed)
+	}
+
+	if conf.RequestsPerSecond != 0 {
+		copy.RequestsPerSecond(fmt.Sprintf("%.2f", conf.RequestsPerSecond))
+	}
+
+	if conf.MaxDocs > 0 {
+		copy.MaxDocs(conf.MaxDocs)
+	}
+
+	if conf.Timeout > 0 {
+		copy.Timeout(formatDuration(conf.Timeout))
+	}
+
+	if conf.Wait {
+		copy.WaitForActiveShards("all")
+	}
+
+	if conf.Refresh {
+		copy.Refresh(true)
+	}
+
+	copy.Source(esdsl.NewReindexSource().Index(conf.SourceIndices...))
+	copy.Dest(esdsl.NewReindexDestination().Index(conf.Index))
+
+	res, err := copy.Do(context.Background())
+	if err != nil {
+		return fmt.Errorf("failed to copy indices: %w", esErrorString(err))
+	}
+
+	table := printer.NewTable(conf, 2, 0).
+		WithHeaders("Reindex metrtic", "value")
+
+	table.Entries = [][]any{
+		{"Source indices", conf.SourceIndices},
+		{"Target index", conf.Index},
+		{"Batches", *res.Batches},
+		{"Documents total", *res.Total},
+		{"Documents created", *res.Created},
+		{"Documents deleted", *res.Deleted},
+		{"Documents updated", *res.Updated},
+		{"Requests/s", *res.RequestsPerSecond},
+		{"Timed out", *res.TimedOut},
+		{"Time elapsed", time.Duration(*res.Took) * time.Millisecond},
+		{"Version conflicts", *res.VersionConflicts},
+	}
+
+	return table.Print()
+}