Apache Solr
Apache Solr is an open-source enterprise search platform built on Apache Lucene. It provides distributed indexing, replication, load-balanced querying, automated failover and recovery, and centralized configuration through SolrCloud. Solr exposes comprehensive REST/HTTP APIs for document indexing, full-text search with faceting and highlighting, schema management, collections management, and cluster operations. It is an Apache Software Foundation project used by major organizations for enterprise-scale search solutions.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Apache Solr the way a machine reads it — 39 machine-readable artifacts across 10 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Apache Solr scores 47.5/100 (developing), with a separate agent-readiness read of 48/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Apache Solr
Each block below is one kind of artifact we hold for Apache Solr. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 10
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Apache Solr Search API
The Solr Search API provides HTTP endpoints for full-text document search, including query parsers (Standard, DisMax, Extended DisMax), JSON Query DSL, faceting and JSON Facet A...
Apache Solr Indexing API
The Solr Indexing API provides HTTP endpoints for adding, updating, and deleting documents from the search index. It supports JSON, XML, CSV, and binary Solr formats via the /up...
Apache Solr Schema API
The Solr Schema API provides REST endpoints for managing the schema of a Solr collection, including field types, fields, dynamic fields, and copy fields. The Managed Schema appr...
Apache Solr Collections API
The Solr Collections API provides REST endpoints for managing SolrCloud collections, shards, replicas, and aliases. It supports collection creation, deletion, modification, shar...
Apache Solr Config API
The Solr Config API and Request Parameters API provide REST endpoints for managing Solr's solrconfig.xml settings at runtime without server restart, including request handler co...
Apache Solr Cluster API
Cluster status and properties
Apache Solr Collections API
Manage SolrCloud collections, replicas, and nodes
Apache Solr Query API
Search a collection
Apache Solr Schema API
Read and modify the schema of a collection
Apache Solr Update API
Index, update, and delete documents
Scroll within the panel for all 10 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Apache Solr HTTP API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Apache Solr Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Apache Solr Finops
FINOPSFeatures 9
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Full-Text Search
Comprehensive full-text search with tokenization, stemming, synonyms, and relevance scoring.
SolrCloud
Distributed search and indexing with automatic sharding, replication, and ZooKeeper coordination.
Faceted Search
Dynamic faceting including field facets, range facets, pivot facets, and JSON Facet API.
Streaming Expressions
SQL-like streaming expressions for distributed corpus analytics and aggregations.
Dense Vector Search
Approximate nearest neighbor (ANN) search for AI/ML vector embeddings using HNSW algorithm.
Learning to Rank
Machine learning-based relevancy tuning with custom feature extraction and model training.
Real-Time Get
Near-real-time document retrieval before documents are committed to the index.
Spatial Search
Geographic and spatial search with distance filtering and bounding box queries.
SQL Interface
SQL query language with JDBC support for analytics tools like Zeppelin and R.
Scroll within the panel for all 9 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Enterprise Search
Unified enterprise search across documents, databases, web content, and file systems.
E-Commerce Product Search
Product catalog search with faceting, filtering, and recommendation engines.
Log Analytics
Log ingestion and search for operational intelligence and security analysis.
AI/ML Vector Search
Semantic and similarity search using dense vector embeddings from AI models.
Content Management Search
Full-text search backend for CMS platforms and digital asset management systems.
Integrations 7
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Apache ZooKeeper
Distributed coordination service for SolrCloud cluster management and configuration.
Apache Kafka
Stream ingestion via Kafka connector for real-time document indexing.
Kubernetes
Solr Kubernetes Operator for cloud-native deployment and management.
Grafana
Metrics integration via Prometheus exporter for Solr cluster monitoring.
Apache Tika
Document parsing for indexing rich content like PDFs, Word documents, and HTML.
Apache NiFi
Data flow integration for automated document ingestion pipelines.
OpenNLP
Natural language processing integration for text analysis and named entity recognition.
Scroll within the panel for all 7 ·
Resources
Every other property we hold for Apache Solr — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/apache-solr · machine-readable index on apis.io