I want implement ElasticSearch in TYPO3 7.6 But i don't know how to implement it inside my custom extension. Please help me here..!!
Thanks In Advance.
There is the mksearch extension, but it does not work on 7.6. You can still take a look at the code to see if you can re-use some parts of it.
Another place I would go to borrow some code is the Elastic Search integration package for FLOW