Complex query and pagination

[kemal-bay]

In order to make a proper pagination, I added a function called complexSearchAndPaginate to trait file.
Issue #33

[timgws]

Looks good to me, thanks @kemal-bay!

Before merging this, I want to place some notes in the documentation specifically about doing efficient searching in Elasticsearch. During working on this project, I am noticing that many people are not really coming from an Elasticsearch background.

This is not specifically a bad thing, however, people may not be aware of the setbacks of using specific methods, and what problems may arise from using them incorrectly.

We should attach a warning on the search functions in the README.md similar to what is in the Elasticsearch guide (https://www.elastic.co/guide/en/elasticsearch/guide/current/pagination.html).

Now imagine that we ask for page 1,000—results 10,001 to 10,010. Everything works in the same way except that each shard has to produce its top 10,010 results. The coordinating node then sorts through all 50,050 results and discards 50,040 of them!

You can see that, in a distributed system, the cost of sorting results grows exponentially the deeper we page. There is a good reason that web search engines don’t return more than 1,000 results for any query.

I think that if people are just dropping Elasticsearch into their Laravel applications without much ES-specific knowledge, we should do our part to 'educate' developers using this module about possible setbacks and warnings for implementations.

[szente]

@timgws please merge this commit, pagination doesn't work at the moment

[timgws]

@szente, I will merge this, as soon as the functionality has been put into the readme file, and the warning put in as per the request I made in February.

Feel free to add another PR for adding the note in the README file, but until that has been done, this will not be merged.

[huglester]

hello @timgws pagination is not accurate.
Can you please exmplain how then to return ie < 1000 results and paginate them 'correctly' ?

Thank you

[mheni]

i want to know how you called the pagination function into the view? @kemal-bay