[Bug]: CouchDB crashes if Clouseau is not available after failed attempts to build search indexes for ddoc with several index functions

[kvzhkv]

Version

3.5.2 (also tried 3.3.1, the same behavior)

Describe the problem you're encountering

CouchDB crashes if Clouseau is not available after failed attempts to build search indexes for ddoc with several index functions

Expected Behaviour

Building indexes should be ignored if Clouseau is not available
Maybe there should be a config setting to explicitly disable Dreyfus, like it is for Nouveau

[nouveau]
enable = false

;suggestion
[dreyfus]
enable = false

There is no such thing https://docs.couchdb.org/en/latest/config/query-servers.html#dreyfus

Steps to Reproduce

Run CouchDB with Docker Compose

services:
    couchdb:
        image: couchdb:3.5.2.1
        ports:
            - "5984:5984"
        environment:
            COUCHDB_USER: admin
            COUCHDB_PASSWORD: couchdbadmin

• Login to Fauxton
• Setup single node instance
• Create test db
• Add ddoc with several index functions

{
  "_id": "_design/legacy_ddoc",
  "views": {},
  "language": "javascript",
  "indexes": {
    "index0": { "index": "function (doc) { return; }" },
    "index1": { "index": "function (doc) { return; }" },
    "index2": { "index": "function (doc) { return; }" },
    "index3": { "index": "function (doc) { return; }" },
    "index4": { "index": "function (doc) { return; }" },
    "index5": { "index": "function (doc) { return; }" },
    "index6": { "index": "function (doc) { return; }" },
    "index7": { "index": "function (doc) { return; }" },
    "index8": { "index": "function (doc) { return; }" }
  }
}

• Watch CouchDB logs

attached complete log file

couch352logs.log

Your Environment

used Docker on MacOS
docker version output

Client:
 Version:           29.1.3
 API version:       1.52
 Go version:        go1.25.5
 Git commit:        f52814d
 Built:             Fri Dec 12 14:48:46 2025
 OS/Arch:           darwin/arm64
 Context:           desktop-linux

Server: Docker Desktop 4.55.0 (213807)
 Engine:
  Version:          29.1.3
  API version:      1.52 (minimum version 1.44)
  Go version:       go1.25.5
  Git commit:       fbf3ed2
  Built:            Fri Dec 12 14:50:40 2025
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          v2.2.0
  GitCommit:        1c4457e00facac03ce1d75f7b6777a7a851e5c41
 runc:
  Version:          1.3.4
  GitCommit:        v1.3.4-0-gd6d73eb8
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

Additional Context

I was replicating data from old CouchDB cluster which uses Clouseau to a new one (version 3.5.2, not going to use Clouseau anymore), was planning to update ddoc search indexes to use Nouveau after moving data.