feature: Elasticsearch CQRS Projection and Analytics Endpoints
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voltsrage
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using Elastic.Clients.Elasticsearch;
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using Elastic.Clients.Elasticsearch.QueryDsl;
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using Microsoft.Extensions.Options;
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public class AnalyticsService : IAnalyticsService
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{
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private readonly ElasticsearchClient _elastic;
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private readonly ElasticsearchOptions _options;
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public AnalyticsService(ElasticsearchClient elastic, IOptions<ElasticsearchOptions> options)
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{
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_elastic = elastic;
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_options = options.Value;
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}
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public async Task<object> GetPopulationAsync(string code, decimal threshold, string direction,
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DateTimeOffset? from, DateTimeOffset? to)
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{
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var filters = new List<Action<QueryDescriptor<ObservationDocument>>>
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{
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fq => fq.Term(t => t.Field(o => o.ObservationCode).Value(code))
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};
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if (direction == "above")
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filters.Add(fq => fq.Range(r => r.NumberRange(nr =>
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nr.Field(o => o.Value).Gt((double)threshold))));
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else
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filters.Add(fq => fq.Range(r => r.NumberRange(nr =>
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nr.Field(o => o.Value).Lt((double)threshold))));
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if (from.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(o => o.RecordedAt).Gte(from.Value.ToString("O")))));
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if (to.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(o => o.RecordedAt).Lte(to.Value.ToString("O")))));
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var resp = await _elastic.SearchAsync<ObservationDocument>(s => s
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.Indices(_options.Indices.Observations)
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.Query(q => q.Bool(b => b.Filter(filters.ToArray())))
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.Aggregations(a => a
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// cardinality: count of distinct patientId values — not a document count.
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// Two observations from the same patient count as one patient.
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.Add("unique_patients", agg => agg.Cardinality(c => c.Field(o => o.PatientId)))
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)
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.Size(0)); // no raw hits — aggregation result only
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if (!resp.IsValidResponse)
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throw new InvalidOperationException("Elasticsearch query failed.");
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var uniquePatients = resp.Aggregations?.GetCardinality("unique_patients")?.Value ?? 0;
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return new
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{
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observationCode = code,
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threshold,
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direction,
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from,
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to,
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uniquePatientCount = uniquePatients
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};
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}
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public async Task<object> GetObservationTrendAsync(Guid encounterId, string code,
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DateTimeOffset? from, DateTimeOffset? to)
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{
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var filters = new List<Action<QueryDescriptor<ObservationDocument>>>
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{
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fq => fq.Term(t => t.Field(o => o.EncounterId).Value(encounterId.ToString())),
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fq => fq.Term(t => t.Field(o => o.ObservationCode).Value(code))
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};
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if (from.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(o => o.RecordedAt).Gte(from.Value.ToString("O")))));
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if (to.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(o => o.RecordedAt).Lte(to.Value.ToString("O")))));
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var resp = await _elastic.SearchAsync<ObservationDocument>(s => s
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.Indices(_options.Indices.Observations)
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.Query(q => q.Bool(b => b.Filter(filters.ToArray())))
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.Aggregations(a => a
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.Add("trend", agg => agg.DateHistogram(h => h
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.Field(o => o.RecordedAt)
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.CalendarInterval(Elastic.Clients.Elasticsearch.Aggregations.CalendarInterval.Hour)
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)
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)
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)
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.Size(0));
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if (!resp.IsValidResponse)
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throw new InvalidOperationException("Elasticsearch query failed.");
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var buckets = resp.Aggregations?.GetDateHistogram("trend")?.Buckets
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.Select(b => new
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{
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hour = b.KeyAsString,
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avg = (double?)null,
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min = (double?)null,
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max = (double?)null,
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count = b.DocCount
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}) ?? Enumerable.Empty<object>();
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return new { encounterId, observationCode = code, trend = buckets };
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}
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public async Task<object> GetAlertSummaryAsync(string? severity, string? department,
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DateTimeOffset? from, DateTimeOffset? to)
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{
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var filters = new List<Action<QueryDescriptor<ClinicalAlertDocument>>>();
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if (from.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(a => a.TriggeredAt).Gte(from.Value.ToString("O")))));
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if (to.HasValue)
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filters.Add(fq => fq.Range(r => r.DateRange(dr =>
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dr.Field(a => a.TriggeredAt).Lte(to.Value.ToString("O")))));
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if (!string.IsNullOrEmpty(severity))
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filters.Add(fq => fq.Term(t => t.Field(a => a.Severity).Value(severity)));
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if (!string.IsNullOrEmpty(department))
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filters.Add(fq => fq.Term(t => t.Field(a => a.Department).Value(department)));
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var resp = await _elastic.SearchAsync<ClinicalAlertDocument>(s => s
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.Indices(_options.Indices.ClinicalAlerts)
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.Query(q => q.Bool(b =>
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{
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if (filters.Count > 0)
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b.Filter(filters.ToArray());
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else
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b.Must(m => m.MatchAll(_ => { }));
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}))
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.Aggregations(a => a
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.Add("by_department", agg => agg.Terms(t => t
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.Field(a => a.Department).Size(50)
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)
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)
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)
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.Size(0));
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if (!resp.IsValidResponse)
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throw new InvalidOperationException("Elasticsearch query failed.");
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var summary = resp.Aggregations?.GetStringTerms("by_department")?.Buckets
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.Select(deptBucket => new
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{
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department = deptBucket.Key,
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total = deptBucket.DocCount,
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bySeverity = Enumerable.Empty<object>()
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}) ?? Enumerable.Empty<object>();
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return new { from, to, summary };
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}
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public async Task<object> SearchPatientsAsync(string? q, string? department, string? status,
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int page, int pageSize)
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{
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var filters = new List<Action<QueryDescriptor<PatientEncounterDocument>>>();
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if (!string.IsNullOrEmpty(department))
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filters.Add(fq => fq.Term(t => t.Field(p => p.Department).Value(department)));
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if (!string.IsNullOrEmpty(status))
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filters.Add(fq => fq.Term(t => t.Field(p => p.Status).Value(status)));
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var resp = await _elastic.SearchAsync<PatientEncounterDocument>(s => s
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.Indices(_options.Indices.PatientEncounters)
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.Query(q2 => q2
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.Bool(b =>
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{
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if (!string.IsNullOrWhiteSpace(q))
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{
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b.Should(
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// MRN: exact keyword match — boosted because MRN lookup is
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// the most common search pattern for clinicians who know the number
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s2 => s2.Term(t => t.Field(p => p.Mrn).Value(q).Boost(3)),
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// Patient name: full-text across the analyzed field
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s2 => s2.Match(m => m.Field(p => p.PatientName).Query(q)),
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// Department: exact filter match included in should for relevance scoring
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s2 => s2.Term(t => t.Field(p => p.Department).Value(q))
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);
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b.MinimumShouldMatch(1);
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}
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else
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{
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b.Must(m => m.MatchAll(_ => { }));
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}
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if (filters.Count > 0)
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b.Filter(filters.ToArray());
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})
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)
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.From(page * pageSize)
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.Size(pageSize));
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if (!resp.IsValidResponse)
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throw new InvalidOperationException("Elasticsearch query failed.");
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return new
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{
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total = resp.Total,
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page,
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pageSize,
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data = resp.Documents
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};
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}
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}
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