Unable to ingest GeoJSON into DDF 2.26.45 (Solr error + ingest fails with no detailed message)

I'm running DDF 2.26.45 on macOS and configured it to use an external Solr 8.6.1 running locally at:

http://localhost:8983/solr

DDF detects Solr correctly:

solr.client = HttpSolrClient solr.http.url = http://localhost:8983/solr

I created a Solr core:

./solr create -c alerts -s 1 -rf 1

Solr starts correctly.

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Goal

I want to ingest a simple GeoJSON file into the DDF catalog.

File: /tmp/test-location.geojson

{ "type": "FeatureCollection", "features": [ { "type": "Feature", "geometry": { "type": "Point", "coordinates": [-77.0369, 38.9072] }, "properties": { "name": "Test Location" } } ] }

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Command used inside DDF Karaf

catalog:ingest -t geojson /tmp/test-location.geojson

Also tried:

catalog:ingest -t geojson -s catalog /tmp/test-location.geojson

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Result

0 file(s) ingested in 0 seconds 1 file(s) failed to be ingested. See the ingest log for more details.

Enabled debug logging:

log:set DEBUG org.codice.ddf.commands.catalog.IngestCommand

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ingest_error.log excerpts

2025-12-03T13:28:26,449 | INFO | location.geojson | ingestLogger | f.commands.catalog.IngestCommand 338 | 455 - catalog-core-commands - 2.26.45 | 0 file(s) ingested in 0 seconds [0 records/sec] 2025-12-03T13:28:26,449 | WARN | location.geojson | ingestLogger | f.commands.catalog.IngestCommand 351 | 455 - catalog-core-commands - 2.26.45 | 1 file(s) failed to be ingested. (repeats every attempt)

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ddf.log Solr error spam

Error retrieving system alert. org.codice.ddf.persistence.PersistenceException Caused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at http://localhost:8983/solr/alerts: can not sort on multivalued field: id_txt of type: text_general

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Additional details

GeoJSON transformers appear in service:list:

id = catalog.data.metacard.geojson id = geojson displayName = GeoJSON shortname = geojson

The ingest command always returns:

0 ingested, 1 failed

The DDF admin UI shows:

"Persistent Storage Not Responding. Could Not Retrieve Alerts."

I only created a single Solr core named "alerts". I'm not sure what cores or configsets DDF requires when using external Solr.

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Question

Exactly what Solr cores and configsets does DDF 2.26.45 require when using external Solr, and how do I configure them so that:

GeoJSON ingestion works The Solr error "cannot sort on multivalued field: id_txt" stops The internal alerts/persistence store initializes properly

If anyone has a working external-Solr setup for DDF 2.26.x, please share the required cores, configsets, and schema.xml examples.