InvalidIndexNameException when creating Elasticsearch index

[oliver.braun]

• Used Zammad version: 2.8
• Used Zammad installation source: package
• Operating system: Ubuntu 16.04

Expected behavior:

Elasticsearch builds the search index when executing ‘zammad run rake searchindex:rebuild’

Actual behavior:

I receive the following error message stating, that the index name is invalid.

drop indexes…done
create indexes…done
create pipeline (pipeline)… rake aborted!
Unable to process DELETE request to elasticsearch URL ‘http://localhost:9200/_ingest/pipeline/zammad624054646167’. Check the response and payload for detailed information:

Response:
#<UserAgent::Result:0x000055c442477f00 @success=false, @body="{“error”:“InvalidIndexNameException[[_ingest] Invalid index name [ingest], must not start with '’]”,“status”:400}", @data=nil, @code=“400”, @content_type=nil, @error=“Client Error: #<Net::HTTPBadRequest 400 Bad Request readbody=true>!”>

Steps to reproduce the behavior:

execute “zammad run rake searchindex:rebuild”

[MrGeneration]

You’re missing the attachment plugin for ES.
Please follow our documentation step by step: https://docs.zammad.org/en/latest/install-elasticsearch.html

If you’re using Elasticsearch 6.x please note that this version is not supported yet.