Updated container group name, added test, updated readme

README.md

@@ -10,7 +10,7 @@ The project is structured in two main components
    2. Create the data collection 
    3. Feed the collection with the input documents, applying the necessary conversions
 
-Step by step guide:
+### Step by step guide
 
 1. Clone this project
 
@@ -108,4 +108,14 @@ Hint: get the docker desktop client for a simplified access to the running conta
 
 https://www.docker.com/products/docker-desktop/
 
+### Interacting with Solr
+
+The Solr and the zookeeper nodes run inside Docker images and interact sharing a network declared in the docker-compose 
+file named `solr`. This implies that the internal cluster information known to Zookeeper refers to such a network. 
+
+When trying to use the `org.apache.solr.client.solrj.impl.CloudSolrClient` to interact with it from outside the `solr` network, 
+it uses the information in Zookeeper to discover the solr nodes, which are however not resolvable from the outside.
+
+The unit test `eu.dnetlib.dhp.solr.SolrClientTest` makes use of the `org.apache.solr.client.solrj.impl.LBHttp2SolrClient` 
+to showcase how to query the Solr cluster running inside Docker, without needing to rely on the nodes discovery through Zookeeper.
 

openaire-solr-test/pom.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>openaire-solr-test</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.solr</groupId>
+            <artifactId>solr-solrj</artifactId>
+            <version>${apache.solr.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.11.3</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <apache.solr.version>9.7.0</apache.solr.version>
+    </properties>
+
+</project>

solr-importer/docker-compose.yml

@@ -1,4 +1,4 @@
-name: openaire-solr-importer
+name: openaire-solr
 services:
   solr1:
     image: solr:9.7.0