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Posted on October 18, 2018 under Nakisa SLAN

Written by:
Ashish Khandelwal
Nakisa SLAN Consultant
akhandelwal@comerit.com

 

SAP Lease Administration by Nakisa (SLAN) is a JAVA application hosted on Tomcat Webserver. Elastic search is a specific function used in Nakisa when things do not perform in a consistent manner. Below are a few examples of problems that can occur within SLAN that the elastic search feature has been able to resolve

Problem 1:

When a new Business Unit to a Company Code is mapped in the application configuration, it might still not be visible in the company code while creating the Master Lease Component:

Elastic search in Nakisa SAP SLAN 

 

Problem 2:

When the dates are not calculating properly in the Lease Component, even with the term mentioned:

elastic search in SAP Nakisa SLAN

 

Problem 3:

When a new file is uploaded, and the GL Accounts are not visible properly in the Accounting Determination:

elastic search feature Nakisa SLAN

 

Many other similar problems can arise in different stages, such as creating contracts, assessing activation groups, etc.

So, what’s the solution? This is the point at which we can turn to Elastic Search.

Elastic Search in SLAN or Nakisa

Elastic search was developed in Java and released as open source under the terms of the Apache License. This versatile tool can be used to comb through several different types of documents. It provides scale-able, near real-time search, and supports multi-tenancy.

Elastic search is distributed, which means that indices can be divided into shards, and each shard can have zero or more replicas. Each node hosts one or more shards, acting as a coordinator to delegate operations to the correct shard(s). Re-balancing and routing are done automatically.

Related data is often stored in the same index, which consists of one or more primary shards and zero or more replica shards. Once an index has been created, the number of primary shards cannot be changed.

Recreating an index in SLAN or Nakisa

Recreating an index in SLAN (Nakisa) creates Elastic search objects (Indexes – under the relevant nodes):

elastic search functionality in SLAN

 

Improving Performance of SLAN Through Elastic Search

The performance of Nakisa depends majorly on the Elastic Search setup. Several parallel tasks, scheduled tasks, and search optimization are based on it. Nakisa supports 2 kinds of Elastic Search: Internal and External. Internal Elastic search in Nakisa is embedded to improve the performance of the application and search technique. This is helpful when an external Elastic search is not set. Although, external Elastic search always has better performance than the embedded Elastic search, and it can be set as follows:

      1. Go to Tomcat Folder -> webapps -> leasing -> Conf.properties
      2. Set dynamic.embedded=false

 Once you complete these steps, you should see this screen:

elastic search_5

 

Setting to Automatic or Manual Indexing

Once the external Elastic search is setup, it is necessary to ensure whether the indexing must be Manual or Automatic. Automatic Elastic Search performs indexing automatically over a certain period of time; it does not require manual intervention. On the other hand, Manual Elastic Search gives more flexibility to index the application as per the user requirement.

Automatic Index: The index operation automatically creates an index if it has not been created before, and automatically creates a dynamic type mapping for the specific type if one has not yet been created.

The mapping itself is very flexible and is schema-free. New fields and objects will automatically be added to the mapping definition of the type specified. 

Automatic index creation can be disabled by enabling the settings below:

Go to Elastic Search Folder  config (ElasticSearch.yml)

      1. auto_create_index: false (Auto/Manual Setting)
      2. mapper.dynamic: false (Index Setting)

If All the Automated Indices are not to be disabled, complex patterns can be used while setting up the elastic search, such as:

  1. auto_create_index: -b*, +a*, -*

elastic search functionalities in NAKISA SAP SLAN

 

Here, the index starting with "a" will be created automatically, but others starting with "b" are not allowed.

-* indicates that other indices are not allowed and if you want you need to create them manually.

 

References

https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-index_.html

https://stackoverflow.com/questions/30931092/how-can-i-disable-the-automatic-index-creation-in-elasticsearch

https://en.wikipedia.org/wiki/Elasticsearch

 

Oct 18, 2018 10:18:04 AM / by Ashish Khandelwal

Ashish Khandelwal

Written by Ashish Khandelwal

Ashish graduated from University of Texas (Dallas) with his Master's degree in IT Management, and went on to join Comerit as an SAP/SLAN Consultant. With expertise in data analysis & business intelligence tools, data mining & warehousing, dashboard reporting, and project management, Ashish continues to grow his skill sets as an integral part of Comerit's technical SLAN team.

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