ASF GitHub Bot commented on NIFI-4516:

Github user MikeThomsen commented on a diff in the pull request:

    --- Diff: 
    @@ -0,0 +1,71 @@
    +<!DOCTYPE html>
    +<html lang="en">
    +  Licensed to the Apache Software Foundation (ASF) under one or more
    +  contributor license agreements.  See the NOTICE file distributed with
    +  this work for additional information regarding copyright ownership.
    +  The ASF licenses this file to You under the Apache License, Version 2.0
    +  (the "License"); you may not use this file except in compliance with
    +  the License.  You may obtain a copy of the License at
    +      http://www.apache.org/licenses/LICENSE-2.0
    +  Unless required by applicable law or agreed to in writing, software
    +  distributed under the License is distributed on an "AS IS" BASIS,
    +  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    +  See the License for the specific language governing permissions and
    +  limitations under the License.
    +    <meta charset="utf-8" />
    +    <title>QuerySolr</title>
    +    <link rel="stylesheet" href="../../../../../css/component-usage.css" 
type="text/css" />
    +<h2>Usage Example</h2>
    +    This processor queries Solr and writes results to FlowFiles. The 
processor can be used at the
    +    beginning of dataflows and later. Solr results can be written to 
FlowFiles as Solr XML or using
    +    records functions (supporting CSV, JSON, etc.). Additionally, facets 
and stats can be retrieved.
    +    They are written to FlowFiles in JSON and sent to designated 
relationships. Furthermore, the
    +    processor can either be configured to retrieve only top results or 
full result sets.
    +    Parameters that can be set multiple times have to be defined as 
dynamic properties (e. g. fq,
    +    facet.field, stats.field). If these parameters must be set multiple 
times with different values,
    +    properties can follow a naming convention:
    +    name.number, where name is the parameter name and number is a unique 
    +    Repeating parameters will be sorted by their property name.
    +    Example: Defining the fq parameter multiple times
    +    <tr>
    +        <th>Property Name</th>
    +        <th>Property Value</th>
    +    </tr>
    +    <tr>
    +        <td>fq.1</td>
    +        <td><code>field1:value1</code></td>
    +    </tr>
    +    <tr>
    +        <td>fq.2</td>
    +        <td><code>field2:value2</code></td>
    +    </tr>
    +    <tr>
    +        <td>fq.3</td>
    +        <td><code>field3:value3</code></td>
    +    </tr>
    +    This definition will be appended to the Solr URL as follows:
    +    fq=field1:value1&fq=field2:value2&fq=field3:value3
    --- End diff --
    This needs detailed documentation for how to add the facet and stats 
support. I had to dig through the code to find that out. I would recommend 
taking the Docker solr demo that I referenced in the comments and using that as 
the basis so that new users can have something pretty painless as a reference 
point for starting out.

> Add FetchSolr processor
> -----------------------
>                 Key: NIFI-4516
>                 URL: https://issues.apache.org/jira/browse/NIFI-4516
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Johannes Peter
>            Assignee: Johannes Peter
>            Priority: Major
>              Labels: features
> The processor shall be capable 
> * to query Solr within a workflow,
> * to make use of standard functionalities of Solr such as faceting, 
> highlighting, result grouping, etc.,
> * to make use of NiFis expression language to build Solr queries, 
> * to handle results as records.

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