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Story 17.3 — Single-cluster quickstarts MD twins (JDBC + ADBC + Arrow Flight SQL) #144

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@fupelaqu

Epic 17 (R1 Documentation & Marketing), Layer 1. The elasticsql MD-mirror half of the single-cluster quickstarts (dual-docs sync; canonical MDX lives in softclient4es-web).

MD twin mapping is asymmetric (Architecture Decision A1): ADBC + Flight SQL twins already exist (augment); JDBC had NO twin → created (A1 default — symmetry + dual-docs constraint).

elasticsql deliverables (base release-r1):

  • UPDATE documentation/client/adbc_driver.md — Your first JOIN, Version compatibility, Licensing & self-selection, honest-gap, Going further (telemetry HOCON/-D/env, no ?telemetry=).
  • UPDATE documentation/client/arrow_flight_sql.md — sidecar-vs-federation, Your first JOIN, in-process-ADBC pointer, version/licensing/honest-gap/Going further.
  • NEW documentation/client/jdbc.md — full mirror of the augmented web JDBC page (# JDBC Driver H1); ?telemetry=false URL opt-out.
  • UPDATE documentation/client/README.md — nav: JDBC / ADBC / Arrow Flight SQL (in-process-then-server order).

All JOIN SQL transcribed verbatim from JdbcIntegrationSpec.scala (jdbc_join_emp/jdbc_join_dept, :799-838 fixture, :1126-1129 PS). Driver-JAR versions ship as the grep-able placeholder <R1_DRIVER_VERSION> (stale 0.1.5/<version> removed). Forward cross-links (../sql/joins.md 17.1, federation_operator_guide.md 17.2, ../sql/known_limitations.md 17.6) carry <!-- pending --> markers; telemetry.md is live.

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