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.

Apache Solr publishes 7 APIs on the APIs.io network, including Schema API, Collections API, Cluster API, and 4 more. Tagged areas include Enterprise Search, Full-Text Search, Lucene, Search, and SolrCloud.

Apache Solr’s developer surface includes authentication, documentation, developer portal, getting-started guide, release notes, support, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.9/100 developing ▬ flat Agent 20/100 agent aware open core · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs 9 Features 5 Use Cases

Enterprise Search Full-Text SearchLuceneSearchSolrCloudOpen-Source Java

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 41.9/100 · developing

Contract Quality 9.0 / 20

Developer Ergonomics 9.1 / 16

Access Clarity 4.2 / 16

Operational Transparency 4.1 / 10

Contract Governance 0.0 / 10

Discoverability 4.7 / 8

Open Source Surface 7.5 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/apache-solr: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

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 for all 10

Open Collections 7

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Apache Solr HTTP Cluster API

OPEN COLLECTION

Apache Solr HTTP Cluster Collections API

OPEN COLLECTION

Apache Solr HTTP Cluster Query API

OPEN COLLECTION

Apache Solr HTTP Cluster Schema API

OPEN COLLECTION

Apache Solr HTTP Cluster Update API

OPEN COLLECTION

Apache Solr HTTP API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Apache Solr Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apache Solr Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Apache Solr Finops

FINOPS

Features 9

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 for all 9

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Apache Solr Authentication

http · 1 scheme

SECURITY

Apache Solr Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Apache Solr Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Apache Solr Agentic Access

21 operations · 10 acting

AGENTIC

Use Cases 5

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 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 for all 7

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 4

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubRepository

GitHubRepository

SolrJ Java Client

SDKs

Solr Kubernetes Operator

SDKs

Access & Security 4

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

ReleaseNotes

ReleaseNotes

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

License

License

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: apache-solr
name: Apache Solr
description: 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.
type: Index
deliveryModel:
  model: open-core
  license: Apache-2.0
  open_source: true
  commercial: true
  callable_host: false
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apache-solr.png
tags:
- Enterprise Search
- Full-Text Search
- Lucene
- Search
- SolrCloud
- Open-Source
- Java
tags_raw:
- Enterprise Search
- Full-Text Search
- Lucene
- Search
- SolrCloud
- Open Source
- Java
created: '2026-03-16'
modified: '2026-04-19'
url: https://raw.githubusercontent.com/api-evangelist/apache-solr/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: apache-solr:apache-solr-search-api
  name: Apache Solr Search API
  description: 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 API, spell checking, suggestions, MoreLikeThis, spatial
    search, dense vector search, result grouping, highlighting, and result clustering. Queries are submitted to the /select
    handler and support complex relevancy scoring with Learning to Rank.
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags:
  - Search
  - Faceting
  - Full-Text Search
  - REST
  - Indexing
  properties:
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/query-guide/json-request-api.html
- aid: apache-solr:apache-solr-indexing-api
  name: Apache Solr Indexing API
  description: 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 /update handler, atomic updates, optimistic concurrency,
    document routing in SolrCloud, and the DataImportHandler for bulk loading from databases and file systems.
  humanURL: https://solr.apache.org/guide/solr/latest/indexing-guide/indexing-with-update-handlers.html
  tags:
  - Indexing
  - Documents
  - REST
  - Updates
  properties:
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/indexing-guide/indexing-with-update-handlers.html
- aid: apache-solr:apache-solr-schema-api
  name: Apache Solr Schema API
  description: 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 approach allows runtime schema modifications without server
    restart via the /schema endpoint.
  humanURL: https://solr.apache.org/guide/solr/latest/indexing-guide/schema-api.html
  tags:
  - Schema
  - REST
  - Management
  properties:
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/indexing-guide/schema-api.html
- aid: apache-solr:apache-solr-collections-api
  name: Apache Solr Collections API
  description: The Solr Collections API provides REST endpoints for managing SolrCloud collections, shards, replicas, and
    aliases. It supports collection creation, deletion, modification, shard splitting, replica management, collection backup/restore,
    alias management, and cross-datacenter replication (CDCR) configuration.
  humanURL: https://solr.apache.org/guide/solr/latest/deployment-guide/cluster-node-management.html
  tags:
  - Collection
  - SolrCloud
  - Cluster
  - Management
  tags_raw:
  - Collections
  - SolrCloud
  - Cluster
  - Management
  properties:
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/deployment-guide/cluster-node-management.html
- aid: apache-solr:apache-solr-config-api
  name: Apache Solr Config API
  description: 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 configuration, search component configuration, query settings,
    and configset management. The v2 API provides a modern JSON-based interface for all configuration operations.
  humanURL: https://solr.apache.org/guide/solr/latest/configuration-guide/config-api.html
  tags:
  - Configuration
  - REST
  - Management
  properties:
  - type: Documentation
    url: https://solr.apache.org/guide/solr/latest/configuration-guide/config-api.html
- aid: apache-solr:apache-solr-cluster-api
  name: Apache Solr Cluster API
  description: Cluster status and properties
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags:
  - Cluster
  properties:
  - type: OpenAPI
    url: openapi/apache-solr-cluster-api-openapi.yml
- aid: apache-solr:apache-solr-collections-api
  name: Apache Solr Collections API
  description: Manage SolrCloud collections, replicas, and nodes
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags:
  - Collection
  tags_raw:
  - Collections
  properties:
  - type: OpenAPI
    url: openapi/apache-solr-collections-api-openapi.yml
- aid: apache-solr:apache-solr-query-api
  name: Apache Solr Query API
  description: Search a collection
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags:
  - Query
  properties:
  - type: OpenAPI
    url: openapi/apache-solr-query-api-openapi.yml
- aid: apache-solr:apache-solr-schema-api
  name: Apache Solr Schema API
  description: Read and modify the schema of a collection
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags:
  - Schema
  properties:
  - type: OpenAPI
    url: openapi/apache-solr-schema-api-openapi.yml
- aid: apache-solr:apache-solr-update-api
  name: Apache Solr Update API
  description: Index, update, and delete documents
  humanURL: https://solr.apache.org/guide/solr/latest/query-guide/query-syntax-and-parsers.html
  tags: []
  tags_raw:
  - Update
  properties:
  - type: OpenAPI
    url: openapi/apache-solr-update-api-openapi.yml
common:
- type: Website
  url: https://www.apache.org/
- type: SecurityPolicy
  url: https://github.com/apache/solr/blob/main/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/apache/.github/blob/main/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/apache/solr/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/apache/solr/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/apache-solr-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/apache-solr-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/apache-solr-domain-security.yml
- type: Authentication
  url: authentication/apache-solr-authentication.yml
- type: GitHubRepository
  url: https://github.com/apache/solr
- type: Documentation
  url: https://solr.apache.org/guide/solr/latest/
- type: Portal
  url: https://solr.apache.org/
- type: GettingStarted
  url: https://solr.apache.org/guide/solr/latest/getting-started/introduction.html
- type: ReleaseNotes
  url: https://github.com/apache/solr/releases
- type: Support
  url: https://solr.apache.org/community.html
- type: TermsOfService
  url: https://www.apache.org/licenses/
- type: SDKs
  url: https://solr.apache.org/guide/solr/latest/deployment-guide/solrj.html
  title: SolrJ Java Client
- type: SDKs
  url: https://github.com/apache/solr-operator
  title: Solr Kubernetes Operator
- type: Features
  data:
  - name: Full-Text Search
    description: Comprehensive full-text search with tokenization, stemming, synonyms, and relevance scoring.
  - name: SolrCloud
    description: Distributed search and indexing with automatic sharding, replication, and ZooKeeper coordination.
  - name: Faceted Search
    description: Dynamic faceting including field facets, range facets, pivot facets, and JSON Facet API.
  - name: Streaming Expressions
    description: SQL-like streaming expressions for distributed corpus analytics and aggregations.
  - name: Dense Vector Search
    description: Approximate nearest neighbor (ANN) search for AI/ML vector embeddings using HNSW algorithm.
  - name: Learning to Rank
    description: Machine learning-based relevancy tuning with custom feature extraction and model training.
  - name: Real-Time Get
    description: Near-real-time document retrieval before documents are committed to the index.
  - name: Spatial Search
    description: Geographic and spatial search with distance filtering and bounding box queries.
  - name: SQL Interface
    description: SQL query language with JDBC support for analytics tools like Zeppelin and R.
- type: UseCases
  data:
  - name: Enterprise Search
    description: Unified enterprise search across documents, databases, web content, and file systems.
  - name: E-Commerce Product Search
    description: Product catalog search with faceting, filtering, and recommendation engines.
  - name: Log Analytics
    description: Log ingestion and search for operational intelligence and security analysis.
  - name: AI/ML Vector Search
    description: Semantic and similarity search using dense vector embeddings from AI models.
  - name: Content Management Search
    description: Full-text search backend for CMS platforms and digital asset management systems.
- type: Integrations
  data:
  - name: Apache ZooKeeper
    description: Distributed coordination service for SolrCloud cluster management and configuration.
  - name: Apache Kafka
    description: Stream ingestion via Kafka connector for real-time document indexing.
  - name: Kubernetes
    description: Solr Kubernetes Operator for cloud-native deployment and management.
  - name: Grafana
    description: Metrics integration via Prometheus exporter for Solr cluster monitoring.
  - name: Apache Tika
    description: Document parsing for indexing rich content like PDFs, Word documents, and HTML.
  - name: Apache NiFi
    description: Data flow integration for automated document ingestion pipelines.
  - name: OpenNLP
    description: Natural language processing integration for text analysis and named entity recognition.
- type: Blog
  url: https://solr.apache.org/news.html
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com

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