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Looking to Upgrade ES 2.4.1 to ES 5.6.4?

Step 1:

• Stop running version(ES 2.4.1)

Step 2:

• Take complete backup of running version (Just to be on safer side)

Step 3:

• Download and install ES 5.6.4
• Reference Link: https://www.elastic.co/downloads/past-releases/elasticsearch-5-6-4

Step 4:

• Start ES 5.6.4  (Note: It creates data folder and other links) 

Step 5:

• Stop ES 5.6.4

Step 6:

• Copy data folder and elasticsearch.yml file in config folder from existing ES 2.4.1 and replace in to ES 5.6.4

Step 7:

• Start ES 5.6.4