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docs(logs): Elasticsearch help examples that work on keyword fields #124

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11 changes: 8 additions & 3 deletions cmd/logs_query.go
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Original file line number Diff line number Diff line change
Expand Up @@ -69,16 +69,21 @@ incomplete. Elasticsearch counts past 10,000 only with "track_total_hits": true.

Counts as series (Elasticsearch): zero or more nested terms aggregations,
optionally ending in one date_histogram. Use real field names from
"nbctl logs list-labels --fields-only"; terms needs a keyword field.`,
"nbctl logs list-labels --fields-only"; terms needs a keyword field.

Check a field's Type before searching it: match on a keyword field compares
the whole value, so {"match":{"log":"error"}} silently finds nothing there.
A case-insensitive wildcard works on keyword and text fields alike.`,
Example: ` # Loki
nbctl logs query --query '{namespace="api"} |= "error"' --start-time 2026-10-01T00:00:00Z

# Elasticsearch, Query DSL (in-cluster Elasticsearch needs --index)
nbctl logs query --index 'logs-*' --query '{"query":{"match":{"level":"error"}}}' -o json > logs.json
nbctl logs query --index 'logs-*' -o json > logs.json \
--query '{"query":{"wildcard":{"log":{"value":"*error*","case_insensitive":true}}}}'

# Elasticsearch, error lines per pod per hour (counts come back as series)
nbctl logs query -o json > counts.json --query '{"size":0,"track_total_hits":true,
"query":{"match":{"log":"error"}},
"query":{"wildcard":{"log":{"value":"*error*","case_insensitive":true}}},
"aggs":{"pod":{"terms":{"field":"kubernetes.pod_name","size":500},
"aggs":{"hour":{"date_histogram":{"field":"@timestamp","fixed_interval":"1h"}}}}}}'`,
RunE: func(cmd *cobra.Command, args []string) error {
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