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You can index resources for their element usages within the selected scope of the Teamwork Cloud repository and later query these usages through the modeling tool. This enables you to evaluate what impact modifying or deleting certain model elements will have on other models that are using it. To enable this functionality, Teamwork Cloud needs to be incorporated with a dedicated search engine - Elasticsearch. This component makes it possible to index model element usage data and serve it quickly when queried from a modeling tool.

Conceptual solution for the global element usage indexing and search functionality.

To start using the global element usage search functionality, you need to install and set up Elasticsearch (v7 series) as described below.

Installing and setting up Elasticsearch

System requirements

• We recommend using NVMe SSD disks for the Elastic search instance.
• The -Xmx value should be set to 4GB as a minimum.
• The expected indexing speed under recommended hardware settings is roughly 1 revision per second.
• The following formula can be used to roughly determine the required disk space per single Indexing Configuration:

Used Project size (element count) x 400 bytes x N x # of Using Projects (specified scope),

where N equals the number of times both using and used elements get changed throughout their history (N tends to range from 4 to 10 as noted from experiments with production data).
The formula also assumes that actual element-level reference ratio is 15-20% from all of the elements in a Used Project.
E.g. A DB size of 250GBs yields an index size of 60GBs under the above mentioned conditions.

Installing Elasticsearch

Go to https://www.elastic.co/downloads/elasticsearch and install Elasticsearch (v7 series).

Enabling global element usage indexing and search

Once you install Elasticsearch, configure Teamwork Cloud as described below to start using the global element usage search functionality.

To enable global element usage search

1. Go to <install_root>/TeamworkCloud/configuration, open the application.conf file, and add the following lines at the end of the file:

   1. To enable the querying component, add the following property and set it to true:

      esi.server.actor.query.component-enabled=true

   2. To enable resource indexing, add the following property and set it to true:

      esi.indexer.enabled = true

   3. If Elasticsearch and Teamwork Cloud run on different machines, add the following line:

      esi.query.es.node.host = "<es.host.or.ip>"

   4. If Elasticsearch is set up to listen on a different port from the default one (9200), add the following line:

      esi.query.es.node.port = <es.port>

2. Restart Teamwork Cloud services.

Now you can index resources for their element usages in the Settings application and use the global element usage search functionality in a modeling tool.

Enabling Encrypted Communication (SSL) with ElasticSearch Server

To enable encrypted communication between Teamwork Cloud and ElasticSearch servers

1. Prepare type PCKS #12 (*.p12) certificate. You can:

• • Use an existing certificate for the machine that will host Elasticsearch, or
  • Generate a new certificate for Elasticsearch using elasticsearch-certutil (https://www.elastic.co/guide/en/elasticsearch/reference/current/certutil.html).

Example:

elasticsearch-certutil cert --self-signed --name <elasticsearch.host.name>

Alternatively, if the certificate subject name does not match the hostname, you can generate the certificate to facilitate the Subject Alternative Name extension:

lasticsearch-certutil cert --self-signed --name <arbitrary.subject.name> --dns <elasticsearch.host.name> --ip <elasticsearch.host.ip>

       2. Configure elasticsearch.yml.

Enable security:

xpack.security.enabled: true

Enable SSL for transport:

xpack.security.transport.ssl.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.keystore.path: <path.to.p12.file>
xpack.security.transport.ssl.keystore.password: changeit

Enable SSL for HTTP (REST API):

xpack.security.http.ssl.enabled: true
xpack.security.http.ssl.verification_mode: certificate
xpack.security.http.ssl.keystore.path: <path.to.p12.file>
xpack.security.http.ssl.keystore.password: changeit

       3. Import the certificate into Java's trusted certificates keystore cacerts.

First, export the X.509 certificate (usually *.crt or *.cer file) from the *.p12 file (for this use tools like OpenSSL or KeyStore Explorer). Then import the certificate file using Java's keytool:

keytool.exe -import -file <path.to.certificate.file> -cacerts -alias <certificate.subject>

       4. Set up Teamwork Cloud: in application.conc, set the following properties:

esi.query.es.security.enabled = true
esi.query.es.security.auth.username = "elastic"
esi.query.es.security.auth.password = "<elastic.password>"
esi.query.es.node.protocol = "https"