Add --try flag to ongr:es:index:create command

[martiis]

Then if index already exists exception should not be thrown, but a clear message outputed saying that index already exists or smth..

[kazysgurskas]

+1

[mvar]

Please give right name for this option. --try is misleading. As far as I understand the expected result is to create index or silently ignore exception if it is already created.

BTW, Doctrine has similar flag on database:create command. It's named --if-not-exists. Not sure about such name, but at least it's not misleading.

[ndinh215]

Yes, this is also my concern. "--if-not-exists" is correct option in Doctrine. Here, we just show error message instead of exception in the case of existing a certain index.
"Try" does not reflect the meaning of purpose. We could use "--if-not-exists" or "--check-index-exists"
@saimaz @mvar how do you think?

[saimaz]

Agree with @mvar --try doesn't say anything. --if-not-exists is more correct option name.

[ndinh215]

I fixed it, please review the PR #535. Thanks.

[mvar]

From now on we have --if-not-exists flag to control if command should check for index existence or not.