1. Search Services

• Search the library
• E-commerce product search
• Searching large amount of system logs

2. Q&A services (also essentially retrieval type)

• Online intelligent customer service
• Robot

3. Map-based services

• Taxi app
• Take-out app
• Community group buying and delivery
• Stranger Social

...

The above are just some of the application scenarios I can think of, in fact, Easy-Es API basically covers more than 90% of Elastic Search's functions, more than 99% of the common functions, so you can quickly build a variety of systems based on EE, even if it is very complex and variable queries, you can also handle it with ease, Trust me!