NiFi Ingest 25.4
NiFi Ingest

# Introduction

This guide has demonstrated how to construct a NiFi dataflow that retrieves information from a repository and indexes it into a text index (see Build a Basic Ingestion Pipeline and Improve the Ingestion Pipeline). Keeping the index up-to-date with the information in your data repositories is just one task (synchronize) that Connectors can perform.

You can use your Connectors to retrieve documents from a repository (the collect action) or delete documents in a repository (the delete action). A full list of supported actions is included below. NiFi Ingest Connectors provide a separate processor for each action, but most repositories do not support every action. For example, you can retrieve pages from the Web but not delete them, so installing the Web Connector provides a `FetchWeb` processor but not a `DeleteWeb` processor.

The synchronize action is usually scheduled to run at regular intervals, but the other actions usually run on-demand in response to a specific request. For example, when a user of a front-end application performs a search they are presented with query results. After selecting one of the results the user might want to view the original file, so the application might send a collect or view action to the relevant connector.

Task | Connector Action | NiFi Processor Name
--- | --- | ---
Prefix | Example
Keep an index, such as your Knowledge Discovery Content component, up-to-date with items in a repository. | Synchronize | `Get*` | `GetFileSystem`
List the items that exist in a repository. | Identifiers | `List*` | `ListFileSystem`
Retrieve one or more items from a repository. | Collect | `Fetch*` | `FetchWeb`
Retrieve an item from a repository in order to view the original file. | View | `View*` | `ViewFileSystem`
Delete one or more items from a repository. | Delete | `Delete*` | `DeleteFileSystem`
Place a legal hold on one or more items in a repository, so that they cannot be deleted, or release an existing hold. | Hold/ReleaseHold | `Hold*` | `HoldSharePointOData`
Insert items into a repository. | Insert | `Put*` | `PutFileSystem`
Update the metadata of one or more items in a repository. | Update | `Patch*` | `PatchFileSystem`

This section describes how to create a dataflow in Apache NiFi that handles requests and performs connector actions on demand, including actions other than synchronize.

Copyright 2018-2025 Open Text
Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery NiFi Ingest 25.4

Topic Title: Introduction